12638752515 has 32 divisors (see below), whose sum is σ = 22529221440. Its totient is φ = 6722569728.

The previous prime is 12638752501. The next prime is 12638752531. The reversal of 12638752515 is 51525783621.

12638752515 is a `hidden beast` number, since 1 + 2 + 6 + 3 + 87 + 52 + 515 = 666.

It is not a de Polignac number, because 12638752515 - 2⁹ = 12638752003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75142 + ... + 175851.

It is an arithmetic number, because the mean of its divisors is an integer number (704038170).

Almost surely, 2^12638752515 is an apocalyptic number.

12638752515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12638752515 is a deficient number, since it is larger than the sum of its proper divisors (9890468925).

12638752515 is a wasteful number, since it uses less digits than its factorization.

12638752515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251380 (or 251374 counting only the distinct ones).

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

The spelling of 12638752515 in words is "twelve billion, six hundred thirty-eight million, seven hundred fifty-two thousand, five hundred fifteen".