49991146569 has 175 divisors, whose sum is σ = 94725654913. Its totient is φ = 26368956432.

The previous prime is 49991146559. The next prime is 49991146603. The reversal of 49991146569 is 96564119994.

The square root of 49991146569 is 223587.

It is a perfect power (a square), and thus also a powerful number.

49991146569 is a `hidden beast` number, since 499 + 91 + 1 + 4 + 6 + 56 + 9 = 666.

49991146569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 24786408969 + 25204737600 = 157437^2 + 158760^2 .

It is not a de Polignac number, because 49991146569 - 2¹⁹ = 49990622281 is a prime.

It is a super-2 number, since 2×49991146569² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a taxicab number since it can be written as a sum of two cubes in more than one way. Here 49991146569 = 897³ + 3666³ = 2457³ + 3276³.

It is not an unprimeable number, because it can be changed into a prime (49991146519) by changing a digit.

It is a polite number, since it can be written in 174 ways as a sum of consecutive naturals, for example, 3845472807 + ... + 3845472819.

Almost surely, 2^49991146569 is an apocalyptic number.

49991146569 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

49991146569 is the 223587-th square number.

49991146569 is the 111794-th centered octagonal number.

It is an amenable number.

49991146569 is a deficient number, since it is larger than the sum of its proper divisors (44734508344).

49991146569 is an frugal number, since it uses more digits than its factorization.

49991146569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 23 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The spelling of 49991146569 in words is "forty-nine billion, nine hundred ninety-one million, one hundred forty-six thousand, five hundred sixty-nine".