641552618 has 16 divisors (see below), whose sum is σ = 1100179584. Its totient is φ = 274857360.

The previous prime is 641552617. The next prime is 641552669. The reversal of 641552618 is 816255146.

It is a happy number.

641552618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (641552617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48896 + ... + 60612.

It is an arithmetic number, because the mean of its divisors is an integer number (68761224).

Almost surely, 2^641552618 is an apocalyptic number.

641552618 is a deficient number, since it is larger than the sum of its proper divisors (458626966).

641552618 is a wasteful number, since it uses less digits than its factorization.

641552618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15637.

The product of its digits is 57600, while the sum is 38.

The square root of 641552618 is about 25328.8890005069. The cubic root of 641552618 is about 862.4701911703.

The spelling of 641552618 in words is "six hundred forty-one million, five hundred fifty-two thousand, six hundred eighteen".