639245018423 has 8 divisors (see below), whose sum is σ = 697794888720. Its totient is φ = 580767929280.

The previous prime is 639245018383. The next prime is 639245018437. The reversal of 639245018423 is 324810542936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639245018423 - 2³⁴ = 622065149239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639245018453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18176918 + ... + 18212051.

It is an arithmetic number, because the mean of its divisors is an integer number (87224361090).

Almost surely, 2^639245018423 is an apocalyptic number.

639245018423 is a deficient number, since it is larger than the sum of its proper divisors (58549870297).

639245018423 is a wasteful number, since it uses less digits than its factorization.

639245018423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36390577.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 639245018423 in words is "six hundred thirty-nine billion, two hundred forty-five million, eighteen thousand, four hundred twenty-three".