642747865718 has 24 divisors (see below), whose sum is σ = 1122670532592. Its totient is φ = 275183102544.

The previous prime is 642747865691. The next prime is 642747865783. The reversal of 642747865718 is 817568747246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3239705 + ... + 3432372.

It is an arithmetic number, because the mean of its divisors is an integer number (46777938858).

Almost surely, 2^642747865718 is an apocalyptic number.

642747865718 is a deficient number, since it is larger than the sum of its proper divisors (479922666874).

642747865718 is a wasteful number, since it uses less digits than its factorization.

642747865718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673076 (or 6673069 counting only the distinct ones).

The product of its digits is 126443520, while the sum is 65.

The spelling of 642747865718 in words is "six hundred forty-two billion, seven hundred forty-seven million, eight hundred sixty-five thousand, seven hundred eighteen".