668364881 has 4 divisors (see below), whose sum is σ = 703542000. Its totient is φ = 633187764.

The previous prime is 668364871. The next prime is 668364941. The reversal of 668364881 is 188463866.

It is a happy number.

668364881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668364881 - 2⁶ = 668364817 is a prime.

It is a super-2 number, since 2×668364881² = 893423228308288322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668364841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17588531 + ... + 17588568.

It is an arithmetic number, because the mean of its divisors is an integer number (175885500).

Almost surely, 2^668364881 is an apocalyptic number.

It is an amenable number.

668364881 is a deficient number, since it is larger than the sum of its proper divisors (35177119).

668364881 is a wasteful number, since it uses less digits than its factorization.

668364881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35177118.

The product of its digits is 1327104, while the sum is 50.

The square root of 668364881 is about 25852.7538378410. The cubic root of 668364881 is about 874.3215992227.

It can be divided in two parts, 66836 and 4881, that added together give a palindrome (71717).

The spelling of 668364881 in words is "six hundred sixty-eight million, three hundred sixty-four thousand, eight hundred eighty-one".