66170081 has 2 divisors, whose sum is σ = 66170082. Its totient is φ = 66170080.

The previous prime is 66170059. The next prime is 66170101. The reversal of 66170081 is 18007166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65351056 + 819025 = 8084^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 66170081 - 2⁶ = 66170017 is a prime.

It is a super-2 number, since 2×66170081² = 8756959239093122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66170021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33085040 + 33085041.

It is an arithmetic number, because the mean of its divisors is an integer number (33085041).

Almost surely, 2^66170081 is an apocalyptic number.

It is an amenable number.

66170081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66170081 is an equidigital number, since it uses as much as digits as its factorization.

66170081 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 29.

The square root of 66170081 is about 8134.4994314340. The cubic root of 66170081 is about 404.4708447732.

The spelling of 66170081 in words is "sixty-six million, one hundred seventy thousand, eighty-one".