666140227 has 2 divisors, whose sum is σ = 666140228. Its totient is φ = 666140226.

The previous prime is 666140213. The next prime is 666140231. The reversal of 666140227 is 722041666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666140227 is a prime.

It is a super-2 number, since 2×666140227² = 887485604055223058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666140192 and 666140201.

It is not a weakly prime, because it can be changed into another prime (666140287) 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, 333070113 + 333070114.

It is an arithmetic number, because the mean of its divisors is an integer number (333070114).

Almost surely, 2^666140227 is an apocalyptic number.

666140227 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140227 is an equidigital number, since it uses as much as digits as its factorization.

666140227 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 666140227 is about 25809.6925010741. The cubic root of 666140227 is about 873.3504604797.

The spelling of 666140227 in words is "six hundred sixty-six million, one hundred forty thousand, two hundred twenty-seven".