23440956561 has 12 divisors (see below), whose sum is σ = 36937265040. Its totient is φ = 14206640280.

The previous prime is 23440956557. The next prime is 23440956569. The reversal of 23440956561 is 16565904432.

23440956561 is a `hidden beast` number, since 2 + 3 + 440 + 95 + 65 + 61 = 666.

It is not a de Polignac number, because 23440956561 - 2² = 23440956557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23440956569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118388571 + ... + 118388768.

It is an arithmetic number, because the mean of its divisors is an integer number (3078105420).

Almost surely, 2^23440956561 is an apocalyptic number.

It is an amenable number.

23440956561 is a deficient number, since it is larger than the sum of its proper divisors (13496308479).

23440956561 is a wasteful number, since it uses less digits than its factorization.

23440956561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236777356 (or 236777353 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 23440956561 in words is "twenty-three billion, four hundred forty million, nine hundred fifty-six thousand, five hundred sixty-one".