641156265 has 24 divisors (see below), whose sum is σ = 1119343680. Its totient is φ = 339486624.

The previous prime is 641156233. The next prime is 641156287. The reversal of 641156265 is 562651146.

641156265 is a `hidden beast` number, since 641 + 1 + 5 + 6 + 2 + 6 + 5 = 666.

It is not a de Polignac number, because 641156265 - 2⁵ = 641156233 is a prime.

It is a super-2 number, since 2×641156265² = 822162712297500450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44997 + ... + 57506.

It is an arithmetic number, because the mean of its divisors is an integer number (46639320).

Almost surely, 2^641156265 is an apocalyptic number.

It is an amenable number.

641156265 is a deficient number, since it is larger than the sum of its proper divisors (478187415).

641156265 is a wasteful number, since it uses less digits than its factorization.

641156265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102653 (or 102650 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 641156265 is about 25321.0636624925. The cubic root of 641156265 is about 862.2925424167.

The spelling of 641156265 in words is "six hundred forty-one million, one hundred fifty-six thousand, two hundred sixty-five".