23309621655 has 16 divisors (see below), whose sum is σ = 39489241824. Its totient is φ = 11700515840.

The previous prime is 23309621651. The next prime is 23309621663. The reversal of 23309621655 is 55612690332.

It is a happy number.

It is not a de Polignac number, because 23309621655 - 2² = 23309621651 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23309621651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45704886 + ... + 45705395.

It is an arithmetic number, because the mean of its divisors is an integer number (2468077614).

Almost surely, 2^23309621655 is an apocalyptic number.

23309621655 is a deficient number, since it is larger than the sum of its proper divisors (16179620169).

23309621655 is a wasteful number, since it uses less digits than its factorization.

23309621655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91410306.

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 23309621655 in words is "twenty-three billion, three hundred nine million, six hundred twenty-one thousand, six hundred fifty-five".