642631690579 has 8 divisors (see below), whose sum is σ = 647553923568. Its totient is φ = 637712812800.

The previous prime is 642631690573. The next prime is 642631690609. The reversal of 642631690579 is 975096136246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642631690579 - 2²¹ = 642629593427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642631690573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453597 + ... + 1221070.

It is an arithmetic number, because the mean of its divisors is an integer number (80944240446).

Almost surely, 2^642631690579 is an apocalyptic number.

642631690579 is a deficient number, since it is larger than the sum of its proper divisors (4922232989).

642631690579 is a wasteful number, since it uses less digits than its factorization.

642631690579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677605.

The product of its (nonzero) digits is 14696640, while the sum is 58.

The spelling of 642631690579 in words is "six hundred forty-two billion, six hundred thirty-one million, six hundred ninety thousand, five hundred seventy-nine".