639715968000 has 1056 divisors, whose sum is σ = 2424235701888. Its totient is φ = 168210432000.

The previous prime is 639715967981. The next prime is 639715968011. The reversal of 639715968000 is 869517936.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4074623922 + ... + 4074624078.

It is an arithmetic number, because the mean of its divisors is an integer number (2295677748).

Almost surely, 2^639715968000 is an apocalyptic number.

639715968000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639715968000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1212117850944).

639715968000 is an abundant number, since it is smaller than the sum of its proper divisors (1784519733888).

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

639715968000 is a wasteful number, since it uses less digits than its factorization.

639715968000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 639715968000 in words is "six hundred thirty-nine billion, seven hundred fifteen million, nine hundred sixty-eight thousand".