641666774 has 8 divisors (see below), whose sum is σ = 1100000208. Its totient is φ = 275000040.

The previous prime is 641666761. The next prime is 641666783. The reversal of 641666774 is 477666146.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 22916657 + ... + 22916684.

It is an arithmetic number, because the mean of its divisors is an integer number (137500026).

Almost surely, 2^641666774 is an apocalyptic number.

641666774 is a deficient number, since it is larger than the sum of its proper divisors (458333434).

641666774 is a wasteful number, since it uses less digits than its factorization.

641666774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45833350.

The product of its digits is 1016064, while the sum is 47.

The square root of 641666774 is about 25331.1423745555. The cubic root of 641666774 is about 862.5213432792.

The spelling of 641666774 in words is "six hundred forty-one million, six hundred sixty-six thousand, seven hundred seventy-four".