668194201 has 2 divisors, whose sum is σ = 668194202. Its totient is φ = 668194200.

The previous prime is 668194187. The next prime is 668194207. The reversal of 668194201 is 102491866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667705600 + 488601 = 25840^2 + 699^2 .

It is a cyclic number.

It is not a de Polignac number, because 668194201 - 2⁵ = 668194169 is a prime.

It is not a weakly prime, because it can be changed into another prime (668194207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334097100 + 334097101.

It is an arithmetic number, because the mean of its divisors is an integer number (334097101).

Almost surely, 2^668194201 is an apocalyptic number.

It is an amenable number.

668194201 is a deficient number, since it is larger than the sum of its proper divisors (1).

668194201 is an equidigital number, since it uses as much as digits as its factorization.

668194201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 668194201 is about 25849.4526247656. The cubic root of 668194201 is about 874.2471678657.

The spelling of 668194201 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, two hundred one".