639170707123 has 8 divisors (see below), whose sum is σ = 690255064800. Its totient is φ = 588360260928.

The previous prime is 639170706991. The next prime is 639170707169. The reversal of 639170707123 is 321707071936.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639170707123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639170707423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68473018 + ... + 68482351.

It is an arithmetic number, because the mean of its divisors is an integer number (86281883100).

Almost surely, 2^639170707123 is an apocalyptic number.

639170707123 is a deficient number, since it is larger than the sum of its proper divisors (51084357677).

639170707123 is a wasteful number, since it uses less digits than its factorization.

639170707123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136955741.

The product of its (nonzero) digits is 333396, while the sum is 46.

The spelling of 639170707123 in words is "six hundred thirty-nine billion, one hundred seventy million, seven hundred seven thousand, one hundred twenty-three".