639940553088 has 256 divisors, whose sum is σ = 1805350256640. Its totient is φ = 200491130880.

The previous prime is 639940553059. The next prime is 639940553171. The reversal of 639940553088 is 880355049936.

It is a super-2 number, since 2×639940553088² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351036145 + ... + 351037967.

It is an arithmetic number, because the mean of its divisors is an integer number (7052149440).

Almost surely, 2^639940553088 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 639940553088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902675128320).

639940553088 is an abundant number, since it is smaller than the sum of its proper divisors (1165409703552).

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

639940553088 is a wasteful number, since it uses less digits than its factorization.

639940553088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705 (or 2693 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 60.

The spelling of 639940553088 in words is "six hundred thirty-nine billion, nine hundred forty million, five hundred fifty-three thousand, eighty-eight".