642642684807 has 32 divisors (see below), whose sum is σ = 932915238912. Its totient is φ = 391851108864.

The previous prime is 642642684751. The next prime is 642642684919. The reversal of 642642684807 is 708486246246.

642642684807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642642684807 - 2⁷ = 642642684679 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642642684107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1346098 + ... + 1759904.

It is an arithmetic number, because the mean of its divisors is an integer number (29153601216).

Almost surely, 2^642642684807 is an apocalyptic number.

642642684807 is a deficient number, since it is larger than the sum of its proper divisors (290272554105).

642642684807 is a wasteful number, since it uses less digits than its factorization.

642642684807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414687.

The product of its (nonzero) digits is 24772608, while the sum is 57.

The spelling of 642642684807 in words is "six hundred forty-two billion, six hundred forty-two million, six hundred eighty-four thousand, eight hundred seven".