66112661 has 2 divisors, whose sum is σ = 66112662. Its totient is φ = 66112660.

The previous prime is 66112639. The next prime is 66112693. The reversal of 66112661 is 16621166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61622500 + 4490161 = 7850^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 66112661 - 2¹⁸ = 65850517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66112601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33056330 + 33056331.

It is an arithmetic number, because the mean of its divisors is an integer number (33056331).

Almost surely, 2^66112661 is an apocalyptic number.

It is an amenable number.

66112661 is a deficient number, since it is larger than the sum of its proper divisors (1).

66112661 is an equidigital number, since it uses as much as digits as its factorization.

66112661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 66112661 is about 8130.9692534162. The cubic root of 66112661 is about 404.3538158650.

The spelling of 66112661 in words is "sixty-six million, one hundred twelve thousand, six hundred sixty-one".