668672011 has 4 divisors (see below), whose sum is σ = 764196592. Its totient is φ = 573147432.

The previous prime is 668672003. The next prime is 668672023. The reversal of 668672011 is 110276866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668672011 - 2³ = 668672003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668672071) 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, 47762280 + ... + 47762293.

It is an arithmetic number, because the mean of its divisors is an integer number (191049148).

Almost surely, 2^668672011 is an apocalyptic number.

668672011 is a deficient number, since it is larger than the sum of its proper divisors (95524581).

668672011 is an equidigital number, since it uses as much as digits as its factorization.

668672011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95524580.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 668672011 is about 25858.6931417657. The cubic root of 668672011 is about 874.4555027630.

The spelling of 668672011 in words is "six hundred sixty-eight million, six hundred seventy-two thousand, eleven".