641916916 has 12 divisors (see below), whose sum is σ = 1124962020. Its totient is φ = 320499200.

The previous prime is 641916853. The next prime is 641916967. The reversal of 641916916 is 619619146.

It can be written as a sum of positive squares in 2 ways, for example, as 491952400 + 149964516 = 22180^2 + 12246^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111661 + ... + 117268.

It is an arithmetic number, because the mean of its divisors is an integer number (93746835).

Almost surely, 2^641916916 is an apocalyptic number.

It is an amenable number.

641916916 is a deficient number, since it is larger than the sum of its proper divisors (483045104).

641916916 is a wasteful number, since it uses less digits than its factorization.

641916916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229634 (or 229632 counting only the distinct ones).

The product of its digits is 69984, while the sum is 43.

The square root of 641916916 is about 25336.0793336301. The cubic root of 641916916 is about 862.6334080834.

The spelling of 641916916 in words is "six hundred forty-one million, nine hundred sixteen thousand, nine hundred sixteen".