641571716 has 12 divisors (see below), whose sum is σ = 1127120988. Its totient is φ = 319537152.

The previous prime is 641571713. The next prime is 641571737. The reversal of 641571716 is 617175146.

641571716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 578210116 + 63361600 = 24046^2 + 7960^2 .

It is a super-2 number, since 2×641571716² = 823228533542369312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641571716.

It is not an unprimeable number, because it can be changed into a prime (641571713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311021 + ... + 313076.

It is an arithmetic number, because the mean of its divisors is an integer number (93926749).

Almost surely, 2^641571716 is an apocalyptic number.

It is an amenable number.

641571716 is a deficient number, since it is larger than the sum of its proper divisors (485549272).

641571716 is a wasteful number, since it uses less digits than its factorization.

641571716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624358 (or 624356 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 641571716 is about 25329.2659980506. The cubic root of 641571716 is about 862.4787492069.

The spelling of 641571716 in words is "six hundred forty-one million, five hundred seventy-one thousand, seven hundred sixteen".