641648655 has 32 divisors (see below), whose sum is σ = 1156792320. Its totient is φ = 337387680.

The previous prime is 641648627. The next prime is 641648699. The reversal of 641648655 is 556846146.

641648655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641648655 - 2⁹ = 641648143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 641648655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23887 + ... + 43056.

It is an arithmetic number, because the mean of its divisors is an integer number (36149760).

Almost surely, 2^641648655 is an apocalyptic number.

641648655 is a deficient number, since it is larger than the sum of its proper divisors (515143665).

641648655 is a wasteful number, since it uses less digits than its factorization.

641648655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67028 (or 67022 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 641648655 is about 25330.7847292578. The cubic root of 641648655 is about 862.5132247500.

The spelling of 641648655 in words is "six hundred forty-one million, six hundred forty-eight thousand, six hundred fifty-five".