641004866 has 4 divisors (see below), whose sum is σ = 961507302. Its totient is φ = 320502432.

The previous prime is 641004857. The next prime is 641004901. The reversal of 641004866 is 668400146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 633579241 + 7425625 = 25171^2 + 2725^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160251215 + ... + 160251218.

Almost surely, 2^641004866 is an apocalyptic number.

641004866 is a deficient number, since it is larger than the sum of its proper divisors (320502436).

641004866 is a wasteful number, since it uses less digits than its factorization.

641004866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320502435.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 641004866 is about 25318.0738998842. The cubic root of 641004866 is about 862.2246647853.

The spelling of 641004866 in words is "six hundred forty-one million, four thousand, eight hundred sixty-six".