23561621440 has 56 divisors (see below), whose sum is σ = 64121275872. Its totient is φ = 8078269440.

The previous prime is 23561621437. The next prime is 23561621453. The reversal of 23561621440 is 4412616532.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 23561621396 and 23561621405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5257051 + ... + 5261530.

Almost surely, 2^23561621440 is an apocalyptic number.

23561621440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23561621440 is an abundant number, since it is smaller than the sum of its proper divisors (40559654432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23561621440 is a wasteful number, since it uses less digits than its factorization.

23561621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10518605 (or 10518595 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 23561621440 in words is "twenty-three billion, five hundred sixty-one million, six hundred twenty-one thousand, four hundred forty".