641725065 has 32 divisors (see below), whose sum is σ = 1144108800. Its totient is φ = 341274240.

The previous prime is 641725043. The next prime is 641725099. The reversal of 641725065 is 560527146.

It is a happy number.

641725065 is a `hidden beast` number, since 641 + 7 + 2 + 5 + 0 + 6 + 5 = 666.

It is not a de Polignac number, because 641725065 - 2⁵ = 641725033 is a prime.

It is a super-2 number, since 2×641725065² = 823622118098508450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 41845 + ... + 55085.

It is an arithmetic number, because the mean of its divisors is an integer number (35753400).

Almost surely, 2^641725065 is an apocalyptic number.

It is an amenable number.

641725065 is a deficient number, since it is larger than the sum of its proper divisors (502383735).

641725065 is a wasteful number, since it uses less digits than its factorization.

641725065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13614 (or 13608 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 641725065 is about 25332.2929281974. The cubic root of 641725065 is about 862.5474605264.

The spelling of 641725065 in words is "six hundred forty-one million, seven hundred twenty-five thousand, sixty-five".