12640399176 has 16 divisors (see below), whose sum is σ = 31600998000. Its totient is φ = 4213466384.

The previous prime is 12640399139. The next prime is 12640399183. The reversal of 12640399176 is 67199304621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263341626 + ... + 263341673.

It is an arithmetic number, because the mean of its divisors is an integer number (1975062375).

Almost surely, 2^12640399176 is an apocalyptic number.

It is an amenable number.

12640399176 is an abundant number, since it is smaller than the sum of its proper divisors (18960598824).

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

12640399176 is a wasteful number, since it uses less digits than its factorization.

12640399176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526683308 (or 526683304 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 12640399176 in words is "twelve billion, six hundred forty million, three hundred ninety-nine thousand, one hundred seventy-six".