667074817 has 2 divisors, whose sum is σ = 667074818. Its totient is φ = 667074816.

The previous prime is 667074809. The next prime is 667074823. The reversal of 667074817 is 718470766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453008656 + 214066161 = 21284^2 + 14631^2 .

It is a cyclic number.

It is not a de Polignac number, because 667074817 - 2³ = 667074809 is a prime.

It is a super-2 number, since 2×667074817² = 889977622951166978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667074017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333537408 + 333537409.

It is an arithmetic number, because the mean of its divisors is an integer number (333537409).

Almost surely, 2^667074817 is an apocalyptic number.

It is an amenable number.

667074817 is a deficient number, since it is larger than the sum of its proper divisors (1).

667074817 is an equidigital number, since it uses as much as digits as its factorization.

667074817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The square root of 667074817 is about 25827.7915625785. The cubic root of 667074817 is about 873.7587044459.

The spelling of 667074817 in words is "six hundred sixty-seven million, seventy-four thousand, eight hundred seventeen".