642231407051 has 16 divisors (see below), whose sum is σ = 698784844800. Its totient is φ = 586722382848.

The previous prime is 642231407033. The next prime is 642231407123. The reversal of 642231407051 is 150704132246.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642231407051 is a prime.

It is a super-2 number, since 2×642231407051² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642231407651) 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, 199715 + ... + 1150803.

It is an arithmetic number, because the mean of its divisors is an integer number (43674052800).

Almost surely, 2^642231407051 is an apocalyptic number.

642231407051 is a deficient number, since it is larger than the sum of its proper divisors (56553437749).

642231407051 is a wasteful number, since it uses less digits than its factorization.

642231407051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951638.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 642231407051 its reverse (150704132246), we get a palindrome (792935539297).

The spelling of 642231407051 in words is "six hundred forty-two billion, two hundred thirty-one million, four hundred seven thousand, fifty-one".