638861713274 has 16 divisors (see below), whose sum is σ = 959175195912. Its totient is φ = 319136770368.

The previous prime is 638861713271. The next prime is 638861713309. The reversal of 638861713274 is 472317168836.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 636792828049 + 2068885225 = 797993^2 + 45485^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638861713271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11369432 + ... + 11425484.

Almost surely, 2^638861713274 is an apocalyptic number.

638861713274 is a deficient number, since it is larger than the sum of its proper divisors (320313482638).

638861713274 is a wasteful number, since it uses less digits than its factorization.

638861713274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61201.

The product of its digits is 8128512, while the sum is 56.

The spelling of 638861713274 in words is "six hundred thirty-eight billion, eight hundred sixty-one million, seven hundred thirteen thousand, two hundred seventy-four".