641085618 has 8 divisors (see below), whose sum is σ = 1282171248. Its totient is φ = 213695204.

The previous prime is 641085587. The next prime is 641085619. The reversal of 641085618 is 816580146.

It is a sphenic number, since it is the product of 3 distinct primes.

641085618 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (641085619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53423796 + ... + 53423807.

It is an arithmetic number, because the mean of its divisors is an integer number (160271406).

Almost surely, 2^641085618 is an apocalyptic number.

641085618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641085618 is a wasteful number, since it uses less digits than its factorization.

641085618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106847608.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 641085618 is about 25319.6685997270. The cubic root of 641085618 is about 862.2608701488.

The spelling of 641085618 in words is "six hundred forty-one million, eighty-five thousand, six hundred eighteen".