638867615356 has 12 divisors (see below), whose sum is σ = 1136346496600. Its totient is φ = 314197187760.

The previous prime is 638867615333. The next prime is 638867615429. The reversal of 638867615356 is 653516768836.

It is a super-3 number, since 3×638867615356³ (a number of 36 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309154706 + ... + 1309155193.

Almost surely, 2^638867615356 is an apocalyptic number.

It is an amenable number.

638867615356 is a deficient number, since it is larger than the sum of its proper divisors (497478881244).

638867615356 is a wasteful number, since it uses less digits than its factorization.

638867615356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618309964 (or 2618309962 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 64.

The spelling of 638867615356 in words is "six hundred thirty-eight billion, eight hundred sixty-seven million, six hundred fifteen thousand, three hundred fifty-six".