641577565 has 16 divisors (see below), whose sum is σ = 792449280. Its totient is φ = 498438720.

The previous prime is 641577551. The next prime is 641577611. The reversal of 641577565 is 565775146.

It is a happy number.

It is not a de Polignac number, because 641577565 - 2²⁵ = 608023133 is a prime.

It is a super-2 number, since 2×641577565² = 823243543822658450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10782 + ... + 37408.

It is an arithmetic number, because the mean of its divisors is an integer number (49528080).

Almost surely, 2^641577565 is an apocalyptic number.

It is an amenable number.

641577565 is a deficient number, since it is larger than the sum of its proper divisors (150871715).

641577565 is a wasteful number, since it uses less digits than its factorization.

641577565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26772.

The product of its digits is 882000, while the sum is 46.

The square root of 641577565 is about 25329.3814571142. The cubic root of 641577565 is about 862.4813701780.

The spelling of 641577565 in words is "six hundred forty-one million, five hundred seventy-seven thousand, five hundred sixty-five".