12568557321 has 16 divisors (see below), whose sum is σ = 18665627200. Its totient is φ = 8358544224.

The previous prime is 12568557319. The next prime is 12568557347. The reversal of 12568557321 is 12375586521.

12568557321 is a `hidden beast` number, since 1 + 2 + 5 + 68 + 557 + 32 + 1 = 666.

It is not a de Polignac number, because 12568557321 - 2¹ = 12568557319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12568567321) 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, 558031 + ... + 580116.

It is an arithmetic number, because the mean of its divisors is an integer number (1166601700).

Almost surely, 2^12568557321 is an apocalyptic number.

It is an amenable number.

12568557321 is a deficient number, since it is larger than the sum of its proper divisors (6097069879).

12568557321 is a wasteful number, since it uses less digits than its factorization.

12568557321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138565 (or 1138559 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The spelling of 12568557321 in words is "twelve billion, five hundred sixty-eight million, five hundred fifty-seven thousand, three hundred twenty-one".