642213911138 has 18 divisors (see below), whose sum is σ = 974419354881. Its totient is φ = 317449145904.

The previous prime is 642213911117. The next prime is 642213911159. The reversal of 642213911138 is 831119312246.

642213911138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642213911117) and next prime (642213911159).

It can be written as a sum of positive squares in 2 ways, for example, as 574068374929 + 68145536209 = 757673^2 + 261047^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=566663.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642213911095 and 642213911104.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 100862831 + ... + 100869197.

Almost surely, 2^642213911138 is an apocalyptic number.

642213911138 is a deficient number, since it is larger than the sum of its proper divisors (332205443743).

642213911138 is an frugal number, since it uses more digits than its factorization.

642213911138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12914 (or 6458 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The spelling of 642213911138 in words is "six hundred forty-two billion, two hundred thirteen million, nine hundred eleven thousand, one hundred thirty-eight".