56961440081 has 48 divisors (see below), whose sum is σ = 73932944400. Its totient is φ = 43447122432.

The previous prime is 56961440057. The next prime is 56961440093. The reversal of 56961440081 is 18004416965.

It can be written as a sum of positive squares in 8 ways, for example, as 11343315025 + 45618125056 = 106505^2 + 213584^2 .

It is not a de Polignac number, because 56961440081 - 2¹⁰ = 56961439057 is a prime.

It is a super-2 number, since 2×56961440081² (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 (56961440021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14277635 + ... + 14281623.

It is an arithmetic number, because the mean of its divisors is an integer number (1540269675).

Almost surely, 2^56961440081 is an apocalyptic number.

It is an amenable number.

56961440081 is a deficient number, since it is larger than the sum of its proper divisors (16971504319).

56961440081 is a wasteful number, since it uses less digits than its factorization.

56961440081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818 (or 4811 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 56961440081 in words is "fifty-six billion, nine hundred sixty-one million, four hundred forty thousand, eighty-one".