12564766857 has 8 divisors (see below), whose sum is σ = 16761436384. Its totient is φ = 8372304288.

The previous prime is 12564766843. The next prime is 12564766859. The reversal of 12564766857 is 75866746521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12564766857 - 2¹² = 12564762761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12564766797 and 12564766806.

It is not an unprimeable number, because it can be changed into a prime (12564766859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1044763 + ... + 1056720.

It is an arithmetic number, because the mean of its divisors is an integer number (2095179548).

Almost surely, 2^12564766857 is an apocalyptic number.

It is an amenable number.

12564766857 is a deficient number, since it is larger than the sum of its proper divisors (4196669527).

12564766857 is a wasteful number, since it uses less digits than its factorization.

12564766857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103479.

The product of its digits is 16934400, while the sum is 57.

The spelling of 12564766857 in words is "twelve billion, five hundred sixty-four million, seven hundred sixty-six thousand, eight hundred fifty-seven".