646118198 has 16 divisors (see below), whose sum is σ = 1085860944. Its totient is φ = 285752160.

The previous prime is 646118183. The next prime is 646118203. The reversal of 646118198 is 891811646.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396065 + ... + 397692.

It is an arithmetic number, because the mean of its divisors is an integer number (67866309).

Almost surely, 2^646118198 is an apocalyptic number.

646118198 is a deficient number, since it is larger than the sum of its proper divisors (439742746).

646118198 is a wasteful number, since it uses less digits than its factorization.

646118198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793807.

The product of its digits is 82944, while the sum is 44.

The square root of 646118198 is about 25418.8551669819. The cubic root of 646118198 is about 864.5112670098.

The spelling of 646118198 in words is "six hundred forty-six million, one hundred eighteen thousand, one hundred ninety-eight".