61264900881 has 20 divisors (see below), whose sum is σ = 94675010100. Its totient is φ = 39434877216.

The previous prime is 61264900861. The next prime is 61264900903. The reversal of 61264900881 is 18800946216.

61264900881 is a `hidden beast` number, since 61 + 26 + 490 + 0 + 8 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21520890000 + 39744010881 = 146700^2 + 199359^2 .

It is not a de Polignac number, because 61264900881 - 2¹⁵ = 61264868113 is a prime.

It is a super-2 number, since 2×61264900881² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61264900861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13038286 + ... + 13042983.

It is an arithmetic number, because the mean of its divisors is an integer number (4733750505).

Almost surely, 2^61264900881 is an apocalyptic number.

It is an amenable number.

61264900881 is a deficient number, since it is larger than the sum of its proper divisors (33410109219).

61264900881 is a wasteful number, since it uses less digits than its factorization.

61264900881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26081310 (or 26081301 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 61264900881 in words is "sixty-one billion, two hundred sixty-four million, nine hundred thousand, eight hundred eighty-one".