641131566 has 16 divisors (see below), whose sum is σ = 1306457424. Its totient is φ = 209678144.

The previous prime is 641131501. The next prime is 641131607. The reversal of 641131566 is 665131146.

641131566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641131566² = 822099369843224712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 1007751 + ... + 1008386.

It is an arithmetic number, because the mean of its divisors is an integer number (81653589).

Almost surely, 2^641131566 is an apocalyptic number.

641131566 is an abundant number, since it is smaller than the sum of its proper divisors (665325858).

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

641131566 is a wasteful number, since it uses less digits than its factorization.

641131566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016195.

The product of its digits is 12960, while the sum is 33.

The square root of 641131566 is about 25320.5759413170. The cubic root of 641131566 is about 862.2814696937.

The spelling of 641131566 in words is "six hundred forty-one million, one hundred thirty-one thousand, five hundred sixty-six".