641568771 has 6 divisors (see below), whose sum is σ = 926710460. Its totient is φ = 427712508.

The previous prime is 641568737. The next prime is 641568853. The reversal of 641568771 is 177865146.

It is not a de Polignac number, because 641568771 - 2¹⁵ = 641536003 is a prime.

It is a super-2 number, since 2×641568771² = 823220975844900882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641568071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35642701 + ... + 35642718.

Almost surely, 2^641568771 is an apocalyptic number.

641568771 is a deficient number, since it is larger than the sum of its proper divisors (285141689).

641568771 is a wasteful number, since it uses less digits than its factorization.

641568771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71285425 (or 71285422 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 641568771 is about 25329.2078636502. The cubic root of 641568771 is about 862.4774295291.

It can be divided in two parts, 64156 and 8771, that added together give a palindrome (72927).

The spelling of 641568771 in words is "six hundred forty-one million, five hundred sixty-eight thousand, seven hundred seventy-one".