12912685956 has 135 divisors (see below), whose sum is σ = 34662066439. Its totient is φ = 4191730992.

The previous prime is 12912685943. The next prime is 12912685963. The reversal of 12912685956 is 65958621921.

The square root of 12912685956 is 113634.

It is a perfect power (a square), and thus also a powerful number.

12912685956 is a `hidden beast` number, since 1 + 29 + 1 + 26 + 8 + 595 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 120679255 + ... + 120679361.

Almost surely, 2^12912685956 is an apocalyptic number.

12912685956 is the 113634-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12912685956

12912685956 is an abundant number, since it is smaller than the sum of its proper divisors (21749380483).

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

12912685956 is an equidigital number, since it uses as much as digits as its factorization.

12912685956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 171 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 12912685956 in words is "twelve billion, nine hundred twelve million, six hundred eighty-five thousand, nine hundred fifty-six".