667726208231 has 2 divisors, whose sum is σ = 667726208232. Its totient is φ = 667726208230.

The previous prime is 667726208209. The next prime is 667726208251. The reversal of 667726208231 is 132802627766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667726208231 - 2¹⁸ = 667725946087 is a prime.

It is a super-2 number, since 2×667726208231² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667726208231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667726208251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333863104115 + 333863104116.

It is an arithmetic number, because the mean of its divisors is an integer number (333863104116).

Almost surely, 2^667726208231 is an apocalyptic number.

667726208231 is a deficient number, since it is larger than the sum of its proper divisors (1).

667726208231 is an equidigital number, since it uses as much as digits as its factorization.

667726208231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 667726208231 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, two hundred eight thousand, two hundred thirty-one".