668091417 has 16 divisors (see below), whose sum is σ = 1039706112. Its totient is φ = 373643280.

The previous prime is 668091377. The next prime is 668091421. The reversal of 668091417 is 714190866.

It is not a de Polignac number, because 668091417 - 2⁶ = 668091353 is a prime.

It is a super-2 number, since 2×668091417² = 892692282938135778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668091427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337459 + ... + 339432.

It is an arithmetic number, because the mean of its divisors is an integer number (64981632).

Almost surely, 2^668091417 is an apocalyptic number.

It is an amenable number.

668091417 is a deficient number, since it is larger than the sum of its proper divisors (371614695).

668091417 is a wasteful number, since it uses less digits than its factorization.

668091417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676948.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 668091417 is about 25847.4644210994. The cubic root of 668091417 is about 874.2023389679.

The spelling of 668091417 in words is "six hundred sixty-eight million, ninety-one thousand, four hundred seventeen".