668650686 has 16 divisors (see below), whose sum is σ = 1458874368. Its totient is φ = 202621400.

The previous prime is 668650669. The next prime is 668650691. The reversal of 668650686 is 686056866.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5065470 + ... + 5065601.

It is an arithmetic number, because the mean of its divisors is an integer number (91179648).

Almost surely, 2^668650686 is an apocalyptic number.

668650686 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

668650686 is an abundant number, since it is smaller than the sum of its proper divisors (790223682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668650686 is a wasteful number, since it uses less digits than its factorization.

668650686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10131087.

The product of its (nonzero) digits is 2488320, while the sum is 51.

The square root of 668650686 is about 25858.2808013217. The cubic root of 668650686 is about 874.4462067446.

The spelling of 668650686 in words is "six hundred sixty-eight million, six hundred fifty thousand, six hundred eighty-six".