642622423165 has 16 divisors (see below), whose sum is σ = 805669804800. Its totient is φ = 491137939072.

The previous prime is 642622423151. The next prime is 642622423169. The reversal of 642622423165 is 561324226246.

It is a cyclic number.

It is not a de Polignac number, because 642622423165 - 2¹⁷ = 642622292093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642622423169) 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, 3360625 + ... + 3546694.

It is an arithmetic number, because the mean of its divisors is an integer number (50354362800).

Almost surely, 2^642622423165 is an apocalyptic number.

It is an amenable number.

642622423165 is a deficient number, since it is larger than the sum of its proper divisors (163047381635).

642622423165 is a wasteful number, since it uses less digits than its factorization.

642622423165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908156.

The product of its digits is 829440, while the sum is 43.

The spelling of 642622423165 in words is "six hundred forty-two billion, six hundred twenty-two million, four hundred twenty-three thousand, one hundred sixty-five".