639161799 has 8 divisors (see below), whose sum is σ = 855457152. Its totient is φ = 424487160.

The previous prime is 639161773. The next prime is 639161807. The reversal of 639161799 is 997161936.

639161799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 639161799 - 2⁸ = 639161543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639161749) 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, 404257 + ... + 405834.

It is an arithmetic number, because the mean of its divisors is an integer number (106932144).

Almost surely, 2^639161799 is an apocalyptic number.

639161799 is a deficient number, since it is larger than the sum of its proper divisors (216295353).

639161799 is a wasteful number, since it uses less digits than its factorization.

639161799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810357.

The product of its digits is 551124, while the sum is 51.

The square root of 639161799 is about 25281.6494517268. The cubic root of 639161799 is about 861.3974930434.

The spelling of 639161799 in words is "six hundred thirty-nine million, one hundred sixty-one thousand, seven hundred ninety-nine".