668091418 has 8 divisors (see below), whose sum is σ = 1006552512. Its totient is φ = 332573916.

The previous prime is 668091377. The next prime is 668091421. The reversal of 668091418 is 814190866.

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

It is a super-2 number, since 2×668091418² = 892692285610501448, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 735330 + ... + 736237.

It is an arithmetic number, because the mean of its divisors is an integer number (125819064).

Almost surely, 2^668091418 is an apocalyptic number.

668091418 is a deficient number, since it is larger than the sum of its proper divisors (338461094).

668091418 is a wasteful number, since it uses less digits than its factorization.

668091418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471796.

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

The square root of 668091418 is about 25847.4644404437. The cubic root of 668091418 is about 874.2023394040.

The spelling of 668091418 in words is "six hundred sixty-eight million, ninety-one thousand, four hundred eighteen".