667081174021 has 2 divisors, whose sum is σ = 667081174022. Its totient is φ = 667081174020.

The previous prime is 667081174013. The next prime is 667081174031. The reversal of 667081174021 is 120471180766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404820425025 + 262260748996 = 636255^2 + 512114^2 .

It is a cyclic number.

It is not a de Polignac number, because 667081174021 - 2³ = 667081174013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667081174031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333540587010 + 333540587011.

It is an arithmetic number, because the mean of its divisors is an integer number (333540587011).

Almost surely, 2^667081174021 is an apocalyptic number.

It is an amenable number.

667081174021 is a deficient number, since it is larger than the sum of its proper divisors (1).

667081174021 is an equidigital number, since it uses as much as digits as its factorization.

667081174021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 667081174021 in words is "six hundred sixty-seven billion, eighty-one million, one hundred seventy-four thousand, twenty-one".