12656587998 has 32 divisors (see below), whose sum is σ = 25517496096. Its totient is φ = 4184857088.

The previous prime is 12656587973. The next prime is 12656588089. The reversal of 12656587998 is 89978565621.

It is a super-2 number, since 2×12656587998² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222090 + ... + 1232402.

It is an arithmetic number, because the mean of its divisors is an integer number (797421753).

Almost surely, 2^12656587998 is an apocalyptic number.

12656587998 is an abundant number, since it is smaller than the sum of its proper divisors (12860908098).

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

12656587998 is a wasteful number, since it uses less digits than its factorization.

12656587998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11948.

The product of its digits is 65318400, while the sum is 66.

The spelling of 12656587998 in words is "twelve billion, six hundred fifty-six million, five hundred eighty-seven thousand, nine hundred ninety-eight".