65564022641 has 4 divisors (see below), whose sum is σ = 70607409012. Its totient is φ = 60520636272.

The previous prime is 65564022637. The next prime is 65564022649. The reversal of 65564022641 is 14622046556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44850768400 + 20713254241 = 211780^2 + 143921^2 .

It is a cyclic number.

It is not a de Polignac number, because 65564022641 - 2² = 65564022637 is a prime.

It is a super-2 number, since 2×65564022641² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65564022649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521693166 + ... + 2521693191.

It is an arithmetic number, because the mean of its divisors is an integer number (17651852253).

Almost surely, 2^65564022641 is an apocalyptic number.

It is an amenable number.

65564022641 is a deficient number, since it is larger than the sum of its proper divisors (5043386371).

65564022641 is a wasteful number, since it uses less digits than its factorization.

65564022641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043386370.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 65564022641 in words is "sixty-five billion, five hundred sixty-four million, twenty-two thousand, six hundred forty-one".