639482733731 has 4 divisors (see below), whose sum is σ = 639526018200. Its totient is φ = 639439449264.

The previous prime is 639482733719. The next prime is 639482733761. The reversal of 639482733731 is 137337284936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 639482733731 - 2³⁸ = 364604826787 is a prime.

It is a super-2 number, since 2×639482733731² (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 (639482733761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21620066 + ... + 21649623.

It is an arithmetic number, because the mean of its divisors is an integer number (159881504550).

Almost surely, 2^639482733731 is an apocalyptic number.

639482733731 is a deficient number, since it is larger than the sum of its proper divisors (43284469).

639482733731 is a wasteful number, since it uses less digits than its factorization.

639482733731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43284468.

The product of its digits is 13716864, while the sum is 56.

The spelling of 639482733731 in words is "six hundred thirty-nine billion, four hundred eighty-two million, seven hundred thirty-three thousand, seven hundred thirty-one".