639530939061 has 24 divisors (see below), whose sum is σ = 1057496169600. Its totient is φ = 364836135456.

The previous prime is 639530939059. The next prime is 639530939063. The reversal of 639530939061 is 160939035936.

It is a happy number.

639530939061 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (639530939059) and next prime (639530939063).

It is not a de Polignac number, because 639530939061 - 2¹ = 639530939059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639530938989 and 639530939007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639530939063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8435790 + ... + 8511263.

It is an arithmetic number, because the mean of its divisors is an integer number (44062340400).

Almost surely, 2^639530939061 is an apocalyptic number.

It is an amenable number.

639530939061 is a deficient number, since it is larger than the sum of its proper divisors (417965230539).

639530939061 is a wasteful number, since it uses less digits than its factorization.

639530939061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16947665 (or 16947662 counting only the distinct ones).

The product of its (nonzero) digits is 3542940, while the sum is 54.

The spelling of 639530939061 in words is "six hundred thirty-nine billion, five hundred thirty million, nine hundred thirty-nine thousand, sixty-one".