641661042 has 16 divisors (see below), whose sum is σ = 1399987872. Its totient is φ = 194442720.

The previous prime is 641661037. The next prime is 641661071. The reversal of 641661042 is 240166146.

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 7 ways as a sum of consecutive naturals, for example, 4861003 + ... + 4861134.

It is an arithmetic number, because the mean of its divisors is an integer number (87499242).

Almost surely, 2^641661042 is an apocalyptic number.

641661042 is an abundant number, since it is smaller than the sum of its proper divisors (758326830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641661042 is a wasteful number, since it uses less digits than its factorization.

641661042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9722153.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 641661042 is about 25331.0292329388. The cubic root of 641661042 is about 862.5187749746.

The spelling of 641661042 in words is "six hundred forty-one million, six hundred sixty-one thousand, forty-two".