12640663498 has 16 divisors (see below), whose sum is σ = 19476986184. Its totient is φ = 6148396800.

The previous prime is 12640663493. The next prime is 12640663499. The reversal of 12640663498 is 89436604621.

It can be written as a sum of positive squares in 4 ways, for example, as 11996163729 + 644499769 = 109527^2 + 25387^2 .

It is not an unprimeable number, because it can be changed into a prime (12640663493) by changing a digit.

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, 519198 + ... + 542998.

Almost surely, 2^12640663498 is an apocalyptic number.

12640663498 is a deficient number, since it is larger than the sum of its proper divisors (6836322686).

12640663498 is a wasteful number, since it uses less digits than its factorization.

12640663498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31017.

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 12640663498 in words is "twelve billion, six hundred forty million, six hundred sixty-three thousand, four hundred ninety-eight".