639460810454 has 4 divisors (see below), whose sum is σ = 959191215684. Its totient is φ = 319730405226.

The previous prime is 639460810441. The next prime is 639460810507. The reversal of 639460810454 is 454018064936.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×639460810454² (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 as a sum of consecutive naturals, namely, 159865202612 + ... + 159865202615.

It is an arithmetic number, because the mean of its divisors is an integer number (239797803921).

Almost surely, 2^639460810454 is an apocalyptic number.

639460810454 is a deficient number, since it is larger than the sum of its proper divisors (319730405230).

639460810454 is a wasteful number, since it uses less digits than its factorization.

639460810454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319730405229.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 639460810454 in words is "six hundred thirty-nine billion, four hundred sixty million, eight hundred ten thousand, four hundred fifty-four".