641643585 has 64 divisors (see below), whose sum is σ = 1199232000. Its totient is φ = 289647360.

The previous prime is 641643571. The next prime is 641643601. The reversal of 641643585 is 585346146.

It is not a de Polignac number, because 641643585 - 2⁶ = 641643521 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 183231 + ... + 186699.

It is an arithmetic number, because the mean of its divisors is an integer number (18738000).

Almost surely, 2^641643585 is an apocalyptic number.

It is an amenable number.

641643585 is a deficient number, since it is larger than the sum of its proper divisors (557588415).

641643585 is a wasteful number, since it uses less digits than its factorization.

641643585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566.

The product of its digits is 345600, while the sum is 42.

The square root of 641643585 is about 25330.6846532027. The cubic root of 641643585 is about 862.5109530220.

The spelling of 641643585 in words is "six hundred forty-one million, six hundred forty-three thousand, five hundred eighty-five".