66455933 has 2 divisors, whose sum is σ = 66455934. Its totient is φ = 66455932.

The previous prime is 66455911. The next prime is 66455951. The reversal of 66455933 is 33955466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56957209 + 9498724 = 7547^2 + 3082^2 .

It is a cyclic number.

It is not a de Polignac number, because 66455933 - 2²⁰ = 65407357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66455903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33227966 + 33227967.

It is an arithmetic number, because the mean of its divisors is an integer number (33227967).

Almost surely, 2^66455933 is an apocalyptic number.

It is an amenable number.

66455933 is a deficient number, since it is larger than the sum of its proper divisors (1).

66455933 is an equidigital number, since it uses as much as digits as its factorization.

66455933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 41.

The square root of 66455933 is about 8152.0508462595. The cubic root of 66455933 is about 405.0524404991.

The spelling of 66455933 in words is "sixty-six million, four hundred fifty-five thousand, nine hundred thirty-three".