666646151 has 2 divisors, whose sum is σ = 666646152. Its totient is φ = 666646150.

The previous prime is 666646139. The next prime is 666646159. The reversal of 666646151 is 151646666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666646151 - 2⁶ = 666646087 is a prime.

It is a super-2 number, since 2×666646151² = 888834181286229602, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 666646099 and 666646108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666646159) 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, 333323075 + 333323076.

It is an arithmetic number, because the mean of its divisors is an integer number (333323076).

Almost surely, 2^666646151 is an apocalyptic number.

666646151 is a deficient number, since it is larger than the sum of its proper divisors (1).

666646151 is an equidigital number, since it uses as much as digits as its factorization.

666646151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 666646151 is about 25819.4916874829. The cubic root of 666646151 is about 873.5715036016.

The spelling of 666646151 in words is "six hundred sixty-six million, six hundred forty-six thousand, one hundred fifty-one".