668091412 has 12 divisors (see below), whose sum is σ = 1172215296. Its totient is φ = 333172760.

The previous prime is 668091377. The next prime is 668091421. The reversal of 668091412 is 214190866.

It is a happy number.

It is a super-2 number, since 2×668091412² = 892692269576307488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216514 + ... + 219577.

It is an arithmetic number, because the mean of its divisors is an integer number (97684608).

Almost surely, 2^668091412 is an apocalyptic number.

It is an amenable number.

668091412 is a deficient number, since it is larger than the sum of its proper divisors (504123884).

668091412 is a wasteful number, since it uses less digits than its factorization.

668091412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436478 (or 436476 counting only the distinct ones).

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

The square root of 668091412 is about 25847.4643243781. The cubic root of 668091412 is about 874.2023367870.

The spelling of 668091412 in words is "six hundred sixty-eight million, ninety-one thousand, four hundred twelve".