668291361 has 8 divisors (see below), whose sum is σ = 896522400. Its totient is φ = 442793952.

The previous prime is 668291359. The next prime is 668291383. The reversal of 668291361 is 163192866.

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

It is not a de Polignac number, because 668291361 - 2¹ = 668291359 is a prime.

It is a super-2 number, since 2×668291361² = 893226686374464642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668291461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682836 + ... + 683813.

It is an arithmetic number, because the mean of its divisors is an integer number (112065300).

Almost surely, 2^668291361 is an apocalyptic number.

It is an amenable number.

668291361 is a deficient number, since it is larger than the sum of its proper divisors (228231039).

668291361 is a wasteful number, since it uses less digits than its factorization.

668291361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366815.

The product of its digits is 93312, while the sum is 42.

The square root of 668291361 is about 25851.3318999235. The cubic root of 668291361 is about 874.2895396483.

The spelling of 668291361 in words is "six hundred sixty-eight million, two hundred ninety-one thousand, three hundred sixty-one".