639458246064 has 40 divisors (see below), whose sum is σ = 1802109604032. Its totient is φ = 193775225920.

The previous prime is 639458246039. The next prime is 639458246113. The reversal of 639458246064 is 460642854936.

It is a junction number, because it is equal to n+sod(n) for n = 639458245995 and 639458246013.

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, 605547054 + ... + 605548109.

Almost surely, 2^639458246064 is an apocalyptic number.

It is an amenable number.

639458246064 is an abundant number, since it is smaller than the sum of its proper divisors (1162651357968).

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

639458246064 is a wasteful number, since it uses less digits than its factorization.

639458246064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211095185 (or 1211095179 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 57.

The spelling of 639458246064 in words is "six hundred thirty-nine billion, four hundred fifty-eight million, two hundred forty-six thousand, sixty-four".