639099968401 has 16 divisors (see below), whose sum is σ = 647317681920. Its totient is φ = 630940001920.

The previous prime is 639099968371. The next prime is 639099968503. The reversal of 639099968401 is 104869990936.

639099968401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 639099968401 - 2²¹ = 639097871249 is a prime.

It is a super-2 number, since 2×639099968401² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639099965401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29253240 + ... + 29275078.

It is an arithmetic number, because the mean of its divisors is an integer number (40457355120).

Almost surely, 2^639099968401 is an apocalyptic number.

It is an amenable number.

639099968401 is a deficient number, since it is larger than the sum of its proper divisors (8217713519).

639099968401 is a wasteful number, since it uses less digits than its factorization.

639099968401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23144.

The product of its (nonzero) digits is 22674816, while the sum is 64.

The spelling of 639099968401 in words is "six hundred thirty-nine billion, ninety-nine million, nine hundred sixty-eight thousand, four hundred one".