639741013632 has 256 divisors, whose sum is σ = 2174858035200. Its totient is φ = 181343038464.

The previous prime is 639741013619. The next prime is 639741013687. The reversal of 639741013632 is 236310147936.

639741013632 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 4 + 1 + 0 + 1 + 3 + 632 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2968273 + ... + 3176495.

It is an arithmetic number, because the mean of its divisors is an integer number (8495539200).

Almost surely, 2^639741013632 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 639741013632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087429017600).

639741013632 is an abundant number, since it is smaller than the sum of its proper divisors (1535117021568).

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

639741013632 is a wasteful number, since it uses less digits than its factorization.

639741013632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208380 (or 208362 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 639741013632 in words is "six hundred thirty-nine billion, seven hundred forty-one million, thirteen thousand, six hundred thirty-two".