642426106553 has 16 divisors (see below), whose sum is σ = 806048421504. Its totient is φ = 497403279360.

The previous prime is 642426106501. The next prime is 642426106561. The reversal of 642426106553 is 355601624246.

It is a happy number.

642426106553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642426106553 is a prime.

It is a super-2 number, since 2×642426106553² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642426106853) 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, 26558600 + ... + 26582777.

It is an arithmetic number, because the mean of its divisors is an integer number (50378026344).

Almost surely, 2^642426106553 is an apocalyptic number.

It is an amenable number.

642426106553 is a deficient number, since it is larger than the sum of its proper divisors (163622314951).

642426106553 is a wasteful number, since it uses less digits than its factorization.

642426106553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53141552.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 642426106553 in words is "six hundred forty-two billion, four hundred twenty-six million, one hundred six thousand, five hundred fifty-three".