642976286623 has 16 divisors (see below), whose sum is σ = 712286438400. Its totient is φ = 575516990880.

The previous prime is 642976286599. The next prime is 642976286681. The reversal of 642976286623 is 326682679246.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642976286623 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 (642976286023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 718536 + ... + 1342477.

It is an arithmetic number, because the mean of its divisors is an integer number (44517902400).

Almost surely, 2^642976286623 is an apocalyptic number.

642976286623 is a deficient number, since it is larger than the sum of its proper divisors (69310151777).

642976286623 is a wasteful number, since it uses less digits than its factorization.

642976286623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061462.

The product of its digits is 62705664, while the sum is 61.

The spelling of 642976286623 in words is "six hundred forty-two billion, nine hundred seventy-six million, two hundred eighty-six thousand, six hundred twenty-three".