66081007 has 2 divisors, whose sum is σ = 66081008. Its totient is φ = 66081006.

The previous prime is 66080957. The next prime is 66081011. The reversal of 66081007 is 70018066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66081007 - 2¹⁵ = 66048239 is a prime.

It is a super-2 number, since 2×66081007² = 8733398972268098, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66081097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33040503 + 33040504.

It is an arithmetic number, because the mean of its divisors is an integer number (33040504).

Almost surely, 2^66081007 is an apocalyptic number.

66081007 is a deficient number, since it is larger than the sum of its proper divisors (1).

66081007 is an equidigital number, since it uses as much as digits as its factorization.

66081007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 66081007 is about 8129.0225119629. The cubic root of 66081007 is about 404.2892722069.

The spelling of 66081007 in words is "sixty-six million, eighty-one thousand, seven".