366666631 has 2 divisors, whose sum is σ = 366666632. Its totient is φ = 366666630.

The previous prime is 366666613. The next prime is 366666647. The reversal of 366666631 is 136666663.

Together with previous prime (366666613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 366666631 - 2²⁷ = 232448903 is a prime.

It is a super-2 number, since 2×366666631² = 268888836577780322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366666431) 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, 183333315 + 183333316.

It is an arithmetic number, because the mean of its divisors is an integer number (183333316).

Almost surely, 2^366666631 is an apocalyptic number.

366666631 is a deficient number, since it is larger than the sum of its proper divisors (1).

366666631 is an equidigital number, since it uses as much as digits as its factorization.

366666631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 43.

The square root of 366666631 is about 19148.5412238113. The cubic root of 366666631 is about 715.7430331322.

The spelling of 366666631 in words is "three hundred sixty-six million, six hundred sixty-six thousand, six hundred thirty-one".