668184391 has 16 divisors (see below), whose sum is σ = 771451200. Its totient is φ = 566899200.

The previous prime is 668184379. The next prime is 668184397. The reversal of 668184391 is 193481866.

It is not a de Polignac number, because 668184391 - 2¹³ = 668176199 is a prime.

It is a super-3 number, since 3×668184391³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668184397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350541 + ... + 352441.

It is an arithmetic number, because the mean of its divisors is an integer number (48215700).

Almost surely, 2^668184391 is an apocalyptic number.

668184391 is a deficient number, since it is larger than the sum of its proper divisors (103266809).

668184391 is a wasteful number, since it uses less digits than its factorization.

668184391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394.

The product of its digits is 248832, while the sum is 46.

The square root of 668184391 is about 25849.2628715018. The cubic root of 668184391 is about 874.2428894655.

The spelling of 668184391 in words is "six hundred sixty-eight million, one hundred eighty-four thousand, three hundred ninety-one".