64521376161 has 32 divisors (see below), whose sum is σ = 94139781120. Its totient is φ = 38983003200.

The previous prime is 64521376133. The next prime is 64521376169. The reversal of 64521376161 is 16167312546.

It is not a de Polignac number, because 64521376161 - 2²¹ = 64519279009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64521376169) 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, 26760046 + ... + 26762456.

It is an arithmetic number, because the mean of its divisors is an integer number (2941868160).

Almost surely, 2^64521376161 is an apocalyptic number.

It is an amenable number.

64521376161 is a deficient number, since it is larger than the sum of its proper divisors (29618404959).

64521376161 is a wasteful number, since it uses less digits than its factorization.

64521376161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597.

The product of its digits is 181440, while the sum is 42.

The spelling of 64521376161 in words is "sixty-four billion, five hundred twenty-one million, three hundred seventy-six thousand, one hundred sixty-one".