641644550 has 24 divisors (see below), whose sum is σ = 1202581512. Its totient is φ = 254696000.

The previous prime is 641644477. The next prime is 641644571. The reversal of 641644550 is 55446146.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 641644550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42431 + ... + 55530.

It is an arithmetic number, because the mean of its divisors is an integer number (50107563).

Almost surely, 2^641644550 is an apocalyptic number.

641644550 is a deficient number, since it is larger than the sum of its proper divisors (560936962).

641644550 is a wasteful number, since it uses less digits than its factorization.

641644550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98104 (or 98099 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 641644550 is about 25330.7037012397. The cubic root of 641644550 is about 862.5113854130.

The spelling of 641644550 in words is "six hundred forty-one million, six hundred forty-four thousand, five hundred fifty".