641326155 has 16 divisors (see below), whose sum is σ = 1061506080. Its totient is φ = 330245888.

The previous prime is 641326151. The next prime is 641326157. The reversal of 641326155 is 551623146.

It is a cyclic number.

It is not a de Polignac number, because 641326155 - 2² = 641326151 is a prime.

It is a super-2 number, since 2×641326155² = 822598474174168050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641326151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736722 + ... + 737591.

It is an arithmetic number, because the mean of its divisors is an integer number (66344130).

Almost surely, 2^641326155 is an apocalyptic number.

641326155 is a deficient number, since it is larger than the sum of its proper divisors (420179925).

641326155 is a wasteful number, since it uses less digits than its factorization.

641326155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474350.

The product of its digits is 21600, while the sum is 33.

The square root of 641326155 is about 25324.4181571858. The cubic root of 641326155 is about 862.3686975085.

The spelling of 641326155 in words is "six hundred forty-one million, three hundred twenty-six thousand, one hundred fifty-five".