668971199 has 16 divisors (see below), whose sum is σ = 764642592. Its totient is φ = 579790848.

The previous prime is 668971189. The next prime is 668971207. The reversal of 668971199 is 991179866.

It is not a de Polignac number, because 668971199 - 2¹⁶ = 668905663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668971139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94487 + ... + 101319.

It is an arithmetic number, because the mean of its divisors is an integer number (47790162).

Almost surely, 2^668971199 is an apocalyptic number.

668971199 is a deficient number, since it is larger than the sum of its proper divisors (95671393).

668971199 is a wasteful number, since it uses less digits than its factorization.

668971199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7306.

The product of its digits is 1469664, while the sum is 56.

The square root of 668971199 is about 25864.4775512671. The cubic root of 668971199 is about 874.5859043041.

The spelling of 668971199 in words is "six hundred sixty-eight million, nine hundred seventy-one thousand, one hundred ninety-nine".