666029191 has 2 divisors, whose sum is σ = 666029192. Its totient is φ = 666029190.

The previous prime is 666029159. The next prime is 666029197. The reversal of 666029191 is 191920666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666029191 - 2⁵ = 666029159 is a prime.

It is a super-2 number, since 2×666029191² = 887189766528228962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666029197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333014595 + 333014596.

It is an arithmetic number, because the mean of its divisors is an integer number (333014596).

Almost surely, 2^666029191 is an apocalyptic number.

666029191 is a deficient number, since it is larger than the sum of its proper divisors (1).

666029191 is an equidigital number, since it uses as much as digits as its factorization.

666029191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 666029191 is about 25807.5413590679. The cubic root of 666029191 is about 873.3019327942.

The spelling of 666029191 in words is "six hundred sixty-six million, twenty-nine thousand, one hundred ninety-one".