66816283 has 2 divisors, whose sum is σ = 66816284. Its totient is φ = 66816282.

The previous prime is 66816271. The next prime is 66816287. The reversal of 66816283 is 38261866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66816283 - 2⁵ = 66816251 is a prime.

It is not a weakly prime, because it can be changed into another prime (66816287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33408141 + 33408142.

It is an arithmetic number, because the mean of its divisors is an integer number (33408142).

Almost surely, 2^66816283 is an apocalyptic number.

66816283 is a deficient number, since it is larger than the sum of its proper divisors (1).

66816283 is an equidigital number, since it uses as much as digits as its factorization.

66816283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 66816283 is about 8174.1227663891. The cubic root of 66816283 is about 405.7832386572.

The spelling of 66816283 in words is "sixty-six million, eight hundred sixteen thousand, two hundred eighty-three".