641216618 has 16 divisors (see below), whose sum is σ = 1103414400. Its totient is φ = 273760656.

The previous prime is 641216603. The next prime is 641216621. The reversal of 641216618 is 816612146.

It is a super-2 number, since 2×641216618² = 822317502398715848, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83393 + ... + 90756.

It is an arithmetic number, because the mean of its divisors is an integer number (68963400).

Almost surely, 2^641216618 is an apocalyptic number.

641216618 is a deficient number, since it is larger than the sum of its proper divisors (462197782).

641216618 is a wasteful number, since it uses less digits than its factorization.

641216618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174421.

The product of its digits is 13824, while the sum is 35.

The square root of 641216618 is about 25322.2553892816. The cubic root of 641216618 is about 862.3195978641.

The spelling of 641216618 in words is "six hundred forty-one million, two hundred sixteen thousand, six hundred eighteen".