642232468161 has 6 divisors (see below), whose sum is σ = 927669120690. Its totient is φ = 428154978768.

The previous prime is 642232468151. The next prime is 642232468231. The reversal of 642232468161 is 161864232246.

642232468161 is a `hidden beast` number, since 6 + 4 + 2 + 23 + 2 + 468 + 161 = 666.

It can be written as a sum of positive squares in only one way, i.e., 396767711025 + 245464757136 = 629895^2 + 495444^2 .

It is not a de Polignac number, because 642232468161 - 2³⁷ = 504793514689 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642232468151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35679581556 + ... + 35679581573.

It is an arithmetic number, because the mean of its divisors is an integer number (154611520115).

Almost surely, 2^642232468161 is an apocalyptic number.

It is an amenable number.

642232468161 is a deficient number, since it is larger than the sum of its proper divisors (285436652529).

642232468161 is a wasteful number, since it uses less digits than its factorization.

642232468161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71359163135 (or 71359163132 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The spelling of 642232468161 in words is "six hundred forty-two billion, two hundred thirty-two million, four hundred sixty-eight thousand, one hundred sixty-one".