638671761115 has 8 divisors (see below), whose sum is σ = 777845010960. Its totient is φ = 503311477152.

The previous prime is 638671761109. The next prime is 638671761163. The reversal of 638671761115 is 511167176836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638671761115 - 2²⁷ = 638537543387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953241100 + ... + 953241769.

It is an arithmetic number, because the mean of its divisors is an integer number (97230626370).

Almost surely, 2^638671761115 is an apocalyptic number.

638671761115 is a deficient number, since it is larger than the sum of its proper divisors (139173249845).

638671761115 is a wasteful number, since it uses less digits than its factorization.

638671761115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906482941.

The product of its digits is 1270080, while the sum is 52.

The spelling of 638671761115 in words is "six hundred thirty-eight billion, six hundred seventy-one million, seven hundred sixty-one thousand, one hundred fifteen".