668180194 has 8 divisors (see below), whose sum is σ = 1093385808. Its totient is φ = 303718260.

The previous prime is 668180171. The next prime is 668180197. The reversal of 668180194 is 491081866.

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

It is a self number, because there is not a number n which added to its sum of digits gives 668180194.

It is not an unprimeable number, because it can be changed into a prime (668180197) 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, 15185892 + ... + 15185935.

It is an arithmetic number, because the mean of its divisors is an integer number (136673226).

Almost surely, 2^668180194 is an apocalyptic number.

668180194 is a deficient number, since it is larger than the sum of its proper divisors (425205614).

668180194 is a wasteful number, since it uses less digits than its factorization.

668180194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30371840.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 668180194 is about 25849.1816891754. The cubic root of 668180194 is about 874.2410590301.

The spelling of 668180194 in words is "six hundred sixty-eight million, one hundred eighty thousand, one hundred ninety-four".