667706872237 has 2 divisors, whose sum is σ = 667706872238. Its totient is φ = 667706872236.

The previous prime is 667706872219. The next prime is 667706872247. The reversal of 667706872237 is 732278607766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554397887241 + 113308984996 = 744579^2 + 336614^2 .

It is a cyclic number.

It is not a de Polignac number, because 667706872237 - 2¹⁵ = 667706839469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667706872207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333853436118 + 333853436119.

It is an arithmetic number, because the mean of its divisors is an integer number (333853436119).

Almost surely, 2^667706872237 is an apocalyptic number.

It is an amenable number.

667706872237 is a deficient number, since it is larger than the sum of its proper divisors (1).

667706872237 is an equidigital number, since it uses as much as digits as its factorization.

667706872237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49787136, while the sum is 61.

The spelling of 667706872237 in words is "six hundred sixty-seven billion, seven hundred six million, eight hundred seventy-two thousand, two hundred thirty-seven".