642515065161 has 16 divisors (see below), whose sum is σ = 910308155328. Its totient is φ = 401712012800.

The previous prime is 642515065117. The next prime is 642515065169. The reversal of 642515065161 is 161560515246.

It is not a de Polignac number, because 642515065161 - 2¹⁸ = 642514803017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642515065169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22402635 + ... + 22431296.

It is an arithmetic number, because the mean of its divisors is an integer number (56894259708).

Almost surely, 2^642515065161 is an apocalyptic number.

It is an amenable number.

642515065161 is a deficient number, since it is larger than the sum of its proper divisors (267793090167).

642515065161 is a wasteful number, since it uses less digits than its factorization.

642515065161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44834232.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 642515065161 in words is "six hundred forty-two billion, five hundred fifteen million, sixty-five thousand, one hundred sixty-one".