639139057991616 has 896 divisors, whose sum is σ = 2186555177304064. Its totient is φ = 160286964203520.

The previous prime is 639139057991593. The next prime is 639139057991671. The reversal of 639139057991616 is 616199750931936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5500704081 + ... + 5500820271.

It is an arithmetic number, because the mean of its divisors is an integer number (2440351760384).

Almost surely, 2^{639139057991616} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639139057991616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093277588652032).

639139057991616 is an abundant number, since it is smaller than the sum of its proper divisors (1547416119312448).

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

639139057991616 is a wasteful number, since it uses less digits than its factorization.

639139057991616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116457 (or 116447 counting only the distinct ones).

The product of its (nonzero) digits is 446410440, while the sum is 75.

The spelling of 639139057991616 in words is "six hundred thirty-nine trillion, one hundred thirty-nine billion, fifty-seven million, nine hundred ninety-one thousand, six hundred sixteen".