646041918 has 8 divisors (see below), whose sum is σ = 1292083848. Its totient is φ = 215347304.

The previous prime is 646041901. The next prime is 646041919. The reversal of 646041918 is 819140646.

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

646041918 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646041919) 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, 53836821 + ... + 53836832.

It is an arithmetic number, because the mean of its divisors is an integer number (161510481).

Almost surely, 2^646041918 is an apocalyptic number.

646041918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646041918 is a wasteful number, since it uses less digits than its factorization.

646041918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107673658.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 646041918 is about 25417.3546617267. The cubic root of 646041918 is about 864.4772445895.

The spelling of 646041918 in words is "six hundred forty-six million, forty-one thousand, nine hundred eighteen".