668366990 has 32 divisors (see below), whose sum is σ = 1270563840. Its totient is φ = 252439200.

The previous prime is 668366983. The next prime is 668367013. The reversal of 668366990 is 99663866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53435 + ... + 64745.

It is an arithmetic number, because the mean of its divisors is an integer number (39705120).

Almost surely, 2^668366990 is an apocalyptic number.

668366990 is a deficient number, since it is larger than the sum of its proper divisors (602196850).

668366990 is a wasteful number, since it uses less digits than its factorization.

668366990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11648.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The square root of 668366990 is about 25852.7946265002. The cubic root of 668366990 is about 874.3225188513.

The spelling of 668366990 in words is "six hundred sixty-eight million, three hundred sixty-six thousand, nine hundred ninety".