666354167 has 2 divisors, whose sum is σ = 666354168. Its totient is φ = 666354166.

The previous prime is 666354133. The next prime is 666354191. The reversal of 666354167 is 761453666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666354167 - 2⁸ = 666353911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666354067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333177083 + 333177084.

It is an arithmetic number, because the mean of its divisors is an integer number (333177084).

Almost surely, 2^666354167 is an apocalyptic number.

666354167 is a deficient number, since it is larger than the sum of its proper divisors (1).

666354167 is an equidigital number, since it uses as much as digits as its factorization.

666354167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 44.

The square root of 666354167 is about 25813.8367353635. The cubic root of 666354167 is about 873.4439466011.

The spelling of 666354167 in words is "six hundred sixty-six million, three hundred fifty-four thousand, one hundred sixty-seven".