23401647909981 has 24 divisors (see below), whose sum is σ = 36875506711680. Its totient is φ = 14182746633600.

The previous prime is 23401647909929. The next prime is 23401647910001. The reversal of 23401647909981 is 18990974610432.

23401647909981 is a `hidden beast` number, since 2 + 3 + 401 + 64 + 7 + 9 + 0 + 99 + 81 = 666.

It is not a de Polignac number, because 23401647909981 - 2⁶ = 23401647909917 is a prime.

It is a super-2 number, since 2×23401647909981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23401647909281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25196860 + ... + 26109098.

It is an arithmetic number, because the mean of its divisors is an integer number (1536479446320).

Almost surely, 2^{23401647909981} is an apocalyptic number.

It is an amenable number.

23401647909981 is a deficient number, since it is larger than the sum of its proper divisors (13473858801699).

23401647909981 is a wasteful number, since it uses less digits than its factorization.

23401647909981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171377 (or 1171374 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 23401647909981 in words is "twenty-three trillion, four hundred one billion, six hundred forty-seven million, nine hundred nine thousand, nine hundred eighty-one".