639980800139 has 2 divisors, whose sum is σ = 639980800140. Its totient is φ = 639980800138.

The previous prime is 639980800099. The next prime is 639980800159. The reversal of 639980800139 is 931008089936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639980800139 - 2⁸ = 639980799883 is a prime.

It is not a weakly prime, because it can be changed into another prime (639980800159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319990400069 + 319990400070.

It is an arithmetic number, because the mean of its divisors is an integer number (319990400070).

Almost surely, 2^639980800139 is an apocalyptic number.

639980800139 is a deficient number, since it is larger than the sum of its proper divisors (1).

639980800139 is an equidigital number, since it uses as much as digits as its factorization.

639980800139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 639980800139 in words is "six hundred thirty-nine billion, nine hundred eighty million, eight hundred thousand, one hundred thirty-nine".