666442151 has 2 divisors, whose sum is σ = 666442152. Its totient is φ = 666442150.

The previous prime is 666442067. The next prime is 666442171. The reversal of 666442151 is 151244666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666442151 is a prime.

It is equal to p_34603379 and since 666442151 and 34603379 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666442171) 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, 333221075 + 333221076.

It is an arithmetic number, because the mean of its divisors is an integer number (333221076).

Almost surely, 2^666442151 is an apocalyptic number.

666442151 is a deficient number, since it is larger than the sum of its proper divisors (1).

666442151 is an equidigital number, since it uses as much as digits as its factorization.

666442151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 666442151 is about 25815.5408814148. The cubic root of 666442151 is about 873.4823874753.

The spelling of 666442151 in words is "six hundred sixty-six million, four hundred forty-two thousand, one hundred fifty-one".