638407045454 has 16 divisors (see below), whose sum is σ = 961766092800. Its totient is φ = 317818761624.

The previous prime is 638407045411. The next prime is 638407045477. The reversal of 638407045454 is 454540704836.

It is a super-2 number, since 2×638407045454² (a number of 24 digits) contains 22 as substring.

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, 3092579 + ... + 3292545.

It is an arithmetic number, because the mean of its divisors is an integer number (60110380800).

Almost surely, 2^638407045454 is an apocalyptic number.

638407045454 is a deficient number, since it is larger than the sum of its proper divisors (323359047346).

638407045454 is a wasteful number, since it uses less digits than its factorization.

638407045454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206887.

The product of its (nonzero) digits is 6451200, while the sum is 50.

The spelling of 638407045454 in words is "six hundred thirty-eight billion, four hundred seven million, forty-five thousand, four hundred fifty-four".