668120321 has 8 divisors (see below), whose sum is σ = 733752000. Its totient is φ = 603304240.

The previous prime is 668120311. The next prime is 668120329. The reversal of 668120321 is 123021866.

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

It is not a de Polignac number, because 668120321 - 2¹⁰ = 668119297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668120329) 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, 202181 + ... + 205458.

It is an arithmetic number, because the mean of its divisors is an integer number (91719000).

Almost surely, 2^668120321 is an apocalyptic number.

It is an amenable number.

668120321 is a deficient number, since it is larger than the sum of its proper divisors (65631679).

668120321 is a wasteful number, since it uses less digits than its factorization.

668120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407799.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 668120321 is about 25848.0235414625. The cubic root of 668120321 is about 874.2149458155.

The spelling of 668120321 in words is "six hundred sixty-eight million, one hundred twenty thousand, three hundred twenty-one".