663918190 has 24 divisors (see below), whose sum is σ = 1294054488. Its totient is φ = 245138400.

The previous prime is 663918181. The next prime is 663918191. The reversal of 663918190 is 91819366.

It is a super-2 number, since 2×663918190² = 881574726025752200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663918191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194736 + ... + 198115.

It is an arithmetic number, because the mean of its divisors is an integer number (53918937).

Almost surely, 2^663918190 is an apocalyptic number.

663918190 is a deficient number, since it is larger than the sum of its proper divisors (630136298).

663918190 is a wasteful number, since it uses less digits than its factorization.

663918190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392884 (or 392871 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 663918190 is about 25766.6099826888. The cubic root of 663918190 is about 872.3783034015.

The spelling of 663918190 in words is "six hundred sixty-three million, nine hundred eighteen thousand, one hundred ninety".