641369665 has 8 divisors (see below), whose sum is σ = 769786560. Its totient is φ = 513000432.

The previous prime is 641369657. The next prime is 641369671. The reversal of 641369665 is 566963146.

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

It is a cyclic number.

It is not a de Polignac number, because 641369665 - 2³ = 641369657 is a prime.

It is a super-2 number, since 2×641369665² = 822710094364424450, 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, 33292 + ... + 48898.

It is an arithmetic number, because the mean of its divisors is an integer number (96223320).

Almost surely, 2^641369665 is an apocalyptic number.

It is an amenable number.

641369665 is a deficient number, since it is larger than the sum of its proper divisors (128416895).

641369665 is a wasteful number, since it uses less digits than its factorization.

641369665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23831.

The product of its digits is 699840, while the sum is 46.

The square root of 641369665 is about 25325.2771949292. The cubic root of 641369665 is about 862.3881991891.

The spelling of 641369665 in words is "six hundred forty-one million, three hundred sixty-nine thousand, six hundred sixty-five".