668855231 has 8 divisors (see below), whose sum is σ = 730069200. Its totient is φ = 607709440.

The previous prime is 668855221. The next prime is 668855237. The reversal of 668855231 is 132558866.

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

It is a cyclic number.

It is not a de Polignac number, because 668855231 - 2¹⁴ = 668838847 is a prime.

It is a super-2 number, since 2×668855231² = 894734640072126722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668855237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4685 + ... + 36873.

It is an arithmetic number, because the mean of its divisors is an integer number (91258650).

Almost surely, 2^668855231 is an apocalyptic number.

668855231 is a deficient number, since it is larger than the sum of its proper divisors (61213969).

668855231 is a wasteful number, since it uses less digits than its factorization.

668855231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34089.

The product of its digits is 345600, while the sum is 44.

The square root of 668855231 is about 25862.2356148884. The cubic root of 668855231 is about 874.5353640917.

The spelling of 668855231 in words is "six hundred sixty-eight million, eight hundred fifty-five thousand, two hundred thirty-one".