639359586851 has 2 divisors, whose sum is σ = 639359586852. Its totient is φ = 639359586850.

The previous prime is 639359586809. The next prime is 639359586923. The reversal of 639359586851 is 158685953936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639359586851 - 2¹⁰ = 639359585827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (639359586751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319679793425 + 319679793426.

It is an arithmetic number, because the mean of its divisors is an integer number (319679793426).

Almost surely, 2^639359586851 is an apocalyptic number.

639359586851 is a deficient number, since it is larger than the sum of its proper divisors (1).

639359586851 is an equidigital number, since it uses as much as digits as its factorization.

639359586851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952000, while the sum is 68.

The spelling of 639359586851 in words is "six hundred thirty-nine billion, three hundred fifty-nine million, five hundred eighty-six thousand, eight hundred fifty-one".