66563933 has 2 divisors, whose sum is σ = 66563934. Its totient is φ = 66563932.

The previous prime is 66563929. The next prime is 66563941. The reversal of 66563933 is 33936566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61889689 + 4674244 = 7867^2 + 2162^2 .

It is a cyclic number.

It is not a de Polignac number, because 66563933 - 2² = 66563929 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66563953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281966 + 33281967.

It is an arithmetic number, because the mean of its divisors is an integer number (33281967).

Almost surely, 2^66563933 is an apocalyptic number.

It is an amenable number.

66563933 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563933 is an equidigital number, since it uses as much as digits as its factorization.

66563933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 41.

The square root of 66563933 is about 8158.6722571752. The cubic root of 66563933 is about 405.2717436544.

The spelling of 66563933 in words is "sixty-six million, five hundred sixty-three thousand, nine hundred thirty-three".