66000791 has 2 divisors, whose sum is σ = 66000792. Its totient is φ = 66000790.

The previous prime is 66000733. The next prime is 66000793. The reversal of 66000791 is 19700066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66000791 - 2¹⁰ = 65999767 is a prime.

It is a super-2 number, since 2×66000791² = 8712208825251362, which contains 22 as substring.

Together with 66000793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000395 + 33000396.

It is an arithmetic number, because the mean of its divisors is an integer number (33000396).

Almost surely, 2^66000791 is an apocalyptic number.

66000791 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000791 is an equidigital number, since it uses as much as digits as its factorization.

66000791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 66000791 is about 8124.0870871748. The cubic root of 66000791 is about 404.1256165107.

The spelling of 66000791 in words is "sixty-six million, seven hundred ninety-one", and thus it is an aban number.