56815258169 has 4 divisors (see below), whose sum is σ = 56817681444. Its totient is φ = 56812834896.

The previous prime is 56815258141. The next prime is 56815258223. The reversal of 56815258169 is 96185251865.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96185251865 = 5 ⋅19237050373.

It can be written as a sum of positive squares in 2 ways, for example, as 45961785769 + 10853472400 = 214387^2 + 104180^2 .

It is a cyclic number.

It is not a de Polignac number, because 56815258169 - 2¹⁶ = 56815192633 is a prime.

It is a super-2 number, since 2×56815258169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56815758169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1176122 + ... + 1223475.

It is an arithmetic number, because the mean of its divisors is an integer number (14204420361).

Almost surely, 2^56815258169 is an apocalyptic number.

It is an amenable number.

56815258169 is a deficient number, since it is larger than the sum of its proper divisors (2423275).

56815258169 is a wasteful number, since it uses less digits than its factorization.

56815258169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423274.

The product of its digits is 5184000, while the sum is 56.

The spelling of 56815258169 in words is "fifty-six billion, eight hundred fifteen million, two hundred fifty-eight thousand, one hundred sixty-nine".