641942018 has 8 divisors (see below), whose sum is σ = 1013592720. Its totient is φ = 304077780.

The previous prime is 641942011. The next prime is 641942047. The reversal of 641942018 is 810249146.

It is a happy number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641942011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8446568 + ... + 8446643.

It is an arithmetic number, because the mean of its divisors is an integer number (126699090).

Almost surely, 2^641942018 is an apocalyptic number.

641942018 is a deficient number, since it is larger than the sum of its proper divisors (371650702).

641942018 is a wasteful number, since it uses less digits than its factorization.

641942018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16893232.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 641942018 is about 25336.5747093012. The cubic root of 641942018 is about 862.6446522911.

The spelling of 641942018 in words is "six hundred forty-one million, nine hundred forty-two thousand, eighteen".