638577123942 has 16 divisors (see below), whose sum is σ = 1277322762240. Its totient is φ = 212830955592.

The previous prime is 638577123931. The next prime is 638577123973. The reversal of 638577123942 is 249321775836.

It is a congruent number.

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, 6972142 + ... + 7063137.

It is an arithmetic number, because the mean of its divisors is an integer number (79832672640).

Almost surely, 2^638577123942 is an apocalyptic number.

638577123942 is an abundant number, since it is smaller than the sum of its proper divisors (638745638298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638577123942 is a wasteful number, since it uses less digits than its factorization.

638577123942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14042867.

The product of its digits is 15240960, while the sum is 57.

The spelling of 638577123942 in words is "six hundred thirty-eight billion, five hundred seventy-seven million, one hundred twenty-three thousand, nine hundred forty-two".