641634166 has 4 divisors (see below), whose sum is σ = 962451252. Its totient is φ = 320817082.

The previous prime is 641634137. The next prime is 641634209. The reversal of 641634166 is 661436146.

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

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, 160408540 + ... + 160408543.

It is an arithmetic number, because the mean of its divisors is an integer number (240612813).

Almost surely, 2^641634166 is an apocalyptic number.

641634166 is a deficient number, since it is larger than the sum of its proper divisors (320817086).

641634166 is a wasteful number, since it uses less digits than its factorization.

641634166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320817085.

The product of its digits is 62208, while the sum is 37.

The square root of 641634166 is about 25330.4987317660. The cubic root of 641634166 is about 862.5067325946.

The spelling of 641634166 in words is "six hundred forty-one million, six hundred thirty-four thousand, one hundred sixty-six".