641825566 has 4 divisors (see below), whose sum is σ = 962738352. Its totient is φ = 320912782.

The previous prime is 641825549. The next prime is 641825627. The reversal of 641825566 is 665528146.

641825566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665528146 = 2 ⋅332764073.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160456390 + ... + 160456393.

It is an arithmetic number, because the mean of its divisors is an integer number (240684588).

Almost surely, 2^641825566 is an apocalyptic number.

641825566 is a deficient number, since it is larger than the sum of its proper divisors (320912786).

641825566 is a wasteful number, since it uses less digits than its factorization.

641825566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320912785.

The product of its digits is 345600, while the sum is 43.

The square root of 641825566 is about 25334.2765043725. The cubic root of 641825566 is about 862.5924862246.

The spelling of 641825566 in words is "six hundred forty-one million, eight hundred twenty-five thousand, five hundred sixty-six".