639825665207 has 2 divisors, whose sum is σ = 639825665208. Its totient is φ = 639825665206.

The previous prime is 639825665153. The next prime is 639825665221. The reversal of 639825665207 is 702566528936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639825665207 - 2¹⁴ = 639825648823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639825665407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319912832603 + 319912832604.

It is an arithmetic number, because the mean of its divisors is an integer number (319912832604).

Almost surely, 2^639825665207 is an apocalyptic number.

639825665207 is a deficient number, since it is larger than the sum of its proper divisors (1).

639825665207 is an equidigital number, since it uses as much as digits as its factorization.

639825665207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32659200, while the sum is 59.

The spelling of 639825665207 in words is "six hundred thirty-nine billion, eight hundred twenty-five million, six hundred sixty-five thousand, two hundred seven".