642442672663 has 4 divisors (see below), whose sum is σ = 700846552008. Its totient is φ = 584038793320.

The previous prime is 642442672643. The next prime is 642442672687. The reversal of 642442672663 is 366276244246.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642442672663 - 2²⁵ = 642409118231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642442672663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642442672643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29201939656 + ... + 29201939677.

It is an arithmetic number, because the mean of its divisors is an integer number (175211638002).

Almost surely, 2^642442672663 is an apocalyptic number.

642442672663 is a deficient number, since it is larger than the sum of its proper divisors (58403879345).

642442672663 is a wasteful number, since it uses less digits than its factorization.

642442672663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58403879344.

The product of its digits is 13934592, while the sum is 52.

The spelling of 642442672663 in words is "six hundred forty-two billion, four hundred forty-two million, six hundred seventy-two thousand, six hundred sixty-three".