641772158 has 8 divisors (see below), whose sum is σ = 1013324520. Its totient is φ = 303997320.

The previous prime is 641772143. The next prime is 641772161. The reversal of 641772158 is 851277146.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8444333 + ... + 8444408.

It is an arithmetic number, because the mean of its divisors is an integer number (126665565).

Almost surely, 2^641772158 is an apocalyptic number.

641772158 is a deficient number, since it is larger than the sum of its proper divisors (371552362).

641772158 is a wasteful number, since it uses less digits than its factorization.

641772158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16888762.

The product of its digits is 94080, while the sum is 41.

The square root of 641772158 is about 25333.2224164239. Note that the first 3 decimals coincide. The cubic root of 641772158 is about 862.5685593614.

The spelling of 641772158 in words is "six hundred forty-one million, seven hundred seventy-two thousand, one hundred fifty-eight".