641636065 has 16 divisors (see below), whose sum is σ = 890563968. Its totient is φ = 434676096.

The previous prime is 641636059. The next prime is 641636087. The reversal of 641636065 is 560636146.

It is a cyclic number.

It is not a de Polignac number, because 641636065 - 2¹³ = 641627873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107532 + ... + 113341.

It is an arithmetic number, because the mean of its divisors is an integer number (55660248).

Almost surely, 2^641636065 is an apocalyptic number.

It is an amenable number.

641636065 is a deficient number, since it is larger than the sum of its proper divisors (248927903).

641636065 is a wasteful number, since it uses less digits than its factorization.

641636065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220968.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 641636065 is about 25330.5362161957. The cubic root of 641636065 is about 862.5075834942.

The spelling of 641636065 in words is "six hundred forty-one million, six hundred thirty-six thousand, sixty-five".