23591981918 has 16 divisors (see below), whose sum is σ = 35841657600. Its totient is φ = 11644979736.

The previous prime is 23591981851. The next prime is 23591981923. The reversal of 23591981918 is 81918919532.

It is a super-2 number, since 2×23591981918² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166733 + ... + 273831.

It is an arithmetic number, because the mean of its divisors is an integer number (2240103600).

Almost surely, 2^23591981918 is an apocalyptic number.

23591981918 is a deficient number, since it is larger than the sum of its proper divisors (12249675682).

23591981918 is a wasteful number, since it uses less digits than its factorization.

23591981918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108511.

The product of its digits is 1399680, while the sum is 56.

The spelling of 23591981918 in words is "twenty-three billion, five hundred ninety-one million, nine hundred eighty-one thousand, nine hundred eighteen".