639014779456 has 21 divisors (see below), whose sum is σ = 1268057643331. Its totient is φ = 319504192192.

The previous prime is 639014779453. The next prime is 639014779457. The reversal of 639014779456 is 654977410936.

The square root of 639014779456 is 799384.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639014779394 and 639014779403.

It is not an unprimeable number, because it can be changed into a prime (639014779453) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6345111 + ... + 6445033.

Almost surely, 2^639014779456 is an apocalyptic number.

639014779456 is the 799384-th square number.

It is an amenable number.

639014779456 is a deficient number, since it is larger than the sum of its proper divisors (629042863875).

639014779456 is an frugal number, since it uses more digits than its factorization.

639014779456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199858 (or 99925 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 639014779456 in words is "six hundred thirty-nine billion, fourteen million, seven hundred seventy-nine thousand, four hundred fifty-six".