642573520823 has 8 divisors (see below), whose sum is σ = 692097189168. Its totient is φ = 593063414784.

The previous prime is 642573520763. The next prime is 642573520837. The reversal of 642573520823 is 328025375246.

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 642573520823 - 2²² = 642569326519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642573520843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3292061 + ... + 3481782.

It is an arithmetic number, because the mean of its divisors is an integer number (86512148646).

Almost surely, 2^642573520823 is an apocalyptic number.

642573520823 is a deficient number, since it is larger than the sum of its proper divisors (49523668345).

642573520823 is a wasteful number, since it uses less digits than its factorization.

642573520823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6781153.

The product of its (nonzero) digits is 2419200, while the sum is 47.

The spelling of 642573520823 in words is "six hundred forty-two billion, five hundred seventy-three million, five hundred twenty thousand, eight hundred twenty-three".