639653969360 has 480 divisors, whose sum is σ = 1868116504320. Its totient is φ = 202358145024.

The previous prime is 639653969351. The next prime is 639653969369. The reversal of 639653969360 is 63969356936.

It is an interprime number because it is at equal distance from previous prime (639653969351) and next prime (639653969369).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639653969369) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 777221909 + ... + 777222731.

It is an arithmetic number, because the mean of its divisors is an integer number (3891909384).

Almost surely, 2^639653969360 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 639653969360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934058252160).

639653969360 is an abundant number, since it is smaller than the sum of its proper divisors (1228462534960).

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

639653969360 is a wasteful number, since it uses less digits than its factorization.

639653969360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 127545840, while the sum is 65.

The spelling of 639653969360 in words is "six hundred thirty-nine billion, six hundred fifty-three million, nine hundred sixty-nine thousand, three hundred sixty".