638712177456 has 40 divisors (see below), whose sum is σ = 1721745872640. Its totient is φ = 203647360576.

The previous prime is 638712177407. The next prime is 638712177463. The reversal of 638712177456 is 654771217836.

It is a junction number, because it is equal to n+sod(n) for n = 638712177396 and 638712177405.

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, 289270716 + ... + 289272923.

It is an arithmetic number, because the mean of its divisors is an integer number (43043646816).

Almost surely, 2^638712177456 is an apocalyptic number.

It is an amenable number.

638712177456 is an abundant number, since it is smaller than the sum of its proper divisors (1083033695184).

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

638712177456 is a wasteful number, since it uses less digits than its factorization.

638712177456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578543673 (or 578543667 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 57.

The spelling of 638712177456 in words is "six hundred thirty-eight billion, seven hundred twelve million, one hundred seventy-seven thousand, four hundred fifty-six".