639616057571 has 2 divisors, whose sum is σ = 639616057572. Its totient is φ = 639616057570.

The previous prime is 639616057547. The next prime is 639616057621. The reversal of 639616057571 is 175750616936.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639616057571 is a prime.

It is a super-2 number, since 2×639616057571² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (639616057511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319808028785 + 319808028786.

It is an arithmetic number, because the mean of its divisors is an integer number (319808028786).

Almost surely, 2^639616057571 is an apocalyptic number.

639616057571 is a deficient number, since it is larger than the sum of its proper divisors (1).

639616057571 is an equidigital number, since it uses as much as digits as its factorization.

639616057571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7144200, while the sum is 56.

The spelling of 639616057571 in words is "six hundred thirty-nine billion, six hundred sixteen million, fifty-seven thousand, five hundred seventy-one".