666830115198 has 80 divisors (see below), whose sum is σ = 1703786238000. Its totient is φ = 193109163264.

The previous prime is 666830115197. The next prime is 666830115209. The reversal of 666830115198 is 891511038666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666830115197) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9276948 + ... + 9348551.

It is an arithmetic number, because the mean of its divisors is an integer number (21297327975).

Almost surely, 2^666830115198 is an apocalyptic number.

666830115198 is an abundant number, since it is smaller than the sum of its proper divisors (1036956122802).

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

666830115198 is a wasteful number, since it uses less digits than its factorization.

666830115198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18625543 (or 18625534 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 666830115198 in words is "six hundred sixty-six billion, eight hundred thirty million, one hundred fifteen thousand, one hundred ninety-eight".