639354044633 has 32 divisors (see below), whose sum is σ = 696992234400. Its totient is φ = 584194830336.

The previous prime is 639354044621. The next prime is 639354044677. The reversal of 639354044633 is 336440453936.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 60306098329 + 579047946304 = 245573^2 + 760952^2 .

It is a cyclic number.

It is not a de Polignac number, because 639354044633 - 2²⁴ = 639337267417 is a prime.

It is a super-2 number, since 2×639354044633² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639354044683) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81411335 + ... + 81419187.

It is an arithmetic number, because the mean of its divisors is an integer number (21781007325).

Almost surely, 2^639354044633 is an apocalyptic number.

It is an amenable number.

639354044633 is a deficient number, since it is larger than the sum of its proper divisors (57638189767).

639354044633 is a wasteful number, since it uses less digits than its factorization.

639354044633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8861.

The product of its (nonzero) digits is 8398080, while the sum is 50.

The spelling of 639354044633 in words is "six hundred thirty-nine billion, three hundred fifty-four million, forty-four thousand, six hundred thirty-three".