642518677670 has 64 divisors (see below), whose sum is σ = 1183140725760. Its totient is φ = 251158710528.

The previous prime is 642518677657. The next prime is 642518677687. The reversal of 642518677670 is 76776815246.

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 31 ways as a sum of consecutive naturals, for example, 236828234 + ... + 236830946.

It is an arithmetic number, because the mean of its divisors is an integer number (18486573840).

Almost surely, 2^642518677670 is an apocalyptic number.

642518677670 is a deficient number, since it is larger than the sum of its proper divisors (540622048090).

642518677670 is a wasteful number, since it uses less digits than its factorization.

642518677670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469.

The product of its (nonzero) digits is 23708160, while the sum is 59.

The spelling of 642518677670 in words is "six hundred forty-two billion, five hundred eighteen million, six hundred seventy-seven thousand, six hundred seventy".