12665646515 has 16 divisors (see below), whose sum is σ = 15377480640. Its totient is φ = 10013498880.

The previous prime is 12665646503. The next prime is 12665646523. The reversal of 12665646515 is 51564656621.

It is not a de Polignac number, because 12665646515 - 2⁶ = 12665646451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12665646515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015970 + ... + 1028360.

It is an arithmetic number, because the mean of its divisors is an integer number (961092540).

Almost surely, 2^12665646515 is an apocalyptic number.

12665646515 is a deficient number, since it is larger than the sum of its proper divisors (2711834125).

12665646515 is a wasteful number, since it uses less digits than its factorization.

12665646515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14782.

The product of its digits is 1296000, while the sum is 47.

The spelling of 12665646515 in words is "twelve billion, six hundred sixty-five million, six hundred forty-six thousand, five hundred fifteen".