12638868407650 has 24 divisors (see below), whose sum is σ = 23750648806500. Its totient is φ = 5003428316160.

The previous prime is 12638868407611. The next prime is 12638868407677. The reversal of 12638868407650 is 5670486883621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 2915491365361 + 9723377042289 = 1707481^2 + 3118233^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1302971275 + ... + 1302980974.

Almost surely, 2^{12638868407650} is an apocalyptic number.

12638868407650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12638868407650 is a deficient number, since it is larger than the sum of its proper divisors (11111780398850).

12638868407650 is a wasteful number, since it uses less digits than its factorization.

12638868407650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605952358 (or 2605952353 counting only the distinct ones).

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 12638868407650 in words is "twelve trillion, six hundred thirty-eight billion, eight hundred sixty-eight million, four hundred seven thousand, six hundred fifty".