639180117 has 12 divisors (see below), whose sum is σ = 926213964. Its totient is φ = 424756800.

The previous prime is 639180109. The next prime is 639180137. The reversal of 639180117 is 711081936.

639180117 is a `hidden beast` number, since 639 + 1 + 8 + 0 + 1 + 17 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15729156 + 623450961 = 3966^2 + 24969^2 .

It is not a de Polignac number, because 639180117 - 2³ = 639180109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639180137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110634 + ... + 116267.

It is an arithmetic number, because the mean of its divisors is an integer number (77184497).

Almost surely, 2^639180117 is an apocalyptic number.

It is an amenable number.

639180117 is a deficient number, since it is larger than the sum of its proper divisors (287033847).

639180117 is a wasteful number, since it uses less digits than its factorization.

639180117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227220 (or 227217 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 639180117 is about 25282.0117277087. The cubic root of 639180117 is about 861.4057220128.

The spelling of 639180117 in words is "six hundred thirty-nine million, one hundred eighty thousand, one hundred seventeen".