642704568771 has 16 divisors (see below), whose sum is σ = 875311027200. Its totient is φ = 419286804288.

The previous prime is 642704568767. The next prime is 642704568773. The reversal of 642704568771 is 177865407246.

It is not a de Polignac number, because 642704568771 - 2² = 642704568767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642704568773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538215 + ... + 1255023.

It is an arithmetic number, because the mean of its divisors is an integer number (54706939200).

Almost surely, 2^642704568771 is an apocalyptic number.

642704568771 is a deficient number, since it is larger than the sum of its proper divisors (232606458429).

642704568771 is a wasteful number, since it uses less digits than its factorization.

642704568771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723218.

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 642704568771 in words is "six hundred forty-two billion, seven hundred four million, five hundred sixty-eight thousand, seven hundred seventy-one".