12564399515 has 8 divisors (see below), whose sum is σ = 15870820560. Its totient is φ = 9522492192.

The previous prime is 12564399469. The next prime is 12564399527. The reversal of 12564399515 is 51599346521.

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

It is a cyclic number.

It is not a de Polignac number, because 12564399515 - 2¹⁸ = 12564137371 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66128324 + ... + 66128513.

It is an arithmetic number, because the mean of its divisors is an integer number (1983852570).

Almost surely, 2^12564399515 is an apocalyptic number.

12564399515 is a deficient number, since it is larger than the sum of its proper divisors (3306421045).

12564399515 is a wasteful number, since it uses less digits than its factorization.

12564399515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132256861.

The product of its digits is 1458000, while the sum is 50.

The spelling of 12564399515 in words is "twelve billion, five hundred sixty-four million, three hundred ninety-nine thousand, five hundred fifteen".