668360761 has 16 divisors (see below), whose sum is σ = 685532160. Its totient is φ = 651508480.

The previous prime is 668360753. The next prime is 668360773. The reversal of 668360761 is 167063866.

668360761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 668360761 - 2³ = 668360753 is a prime.

It is a super-2 number, since 2×668360761² = 893412213688998242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668360731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3499176 + ... + 3499366.

It is an arithmetic number, because the mean of its divisors is an integer number (42845760).

Almost surely, 2^668360761 is an apocalyptic number.

It is an amenable number.

668360761 is a deficient number, since it is larger than the sum of its proper divisors (17171399).

668360761 is a wasteful number, since it uses less digits than its factorization.

668360761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 668360761 is about 25852.6741556846. The cubic root of 668360761 is about 874.3198026929.

The spelling of 668360761 in words is "six hundred sixty-eight million, three hundred sixty thousand, seven hundred sixty-one".