12640163325 has 12 divisors (see below), whose sum is σ = 20898403488. Its totient is φ = 6741420400.

The previous prime is 12640163303. The next prime is 12640163351. The reversal of 12640163325 is 52336104621.

It is not a de Polignac number, because 12640163325 - 2⁸ = 12640163069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84267681 + ... + 84267830.

It is an arithmetic number, because the mean of its divisors is an integer number (1741533624).

Almost surely, 2^12640163325 is an apocalyptic number.

12640163325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12640163325 is a deficient number, since it is larger than the sum of its proper divisors (8258240163).

12640163325 is a wasteful number, since it uses less digits than its factorization.

12640163325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168535524 (or 168535519 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 12640163325 its reverse (52336104621), we get a palindrome (64976267946).

The spelling of 12640163325 in words is "twelve billion, six hundred forty million, one hundred sixty-three thousand, three hundred twenty-five".