641395265 has 8 divisors (see below), whose sum is σ = 879627840. Its totient is φ = 439813872.

The previous prime is 641395253. The next prime is 641395283. The reversal of 641395265 is 562593146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641395265 is a prime.

It is a super-2 number, since 2×641395265² = 822775771928840450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9162755 + ... + 9162824.

It is an arithmetic number, because the mean of its divisors is an integer number (109953480).

Almost surely, 2^641395265 is an apocalyptic number.

It is an amenable number.

641395265 is a deficient number, since it is larger than the sum of its proper divisors (238232575).

641395265 is a wasteful number, since it uses less digits than its factorization.

641395265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18325591.

The product of its digits is 194400, while the sum is 41.

The square root of 641395265 is about 25325.7826137713. The cubic root of 641395265 is about 862.3996729904.

The spelling of 641395265 in words is "six hundred forty-one million, three hundred ninety-five thousand, two hundred sixty-five".