66535818233 has 2 divisors, whose sum is σ = 66535818234. Its totient is φ = 66535818232.

The previous prime is 66535818221. The next prime is 66535818253. The reversal of 66535818233 is 33281853566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43629601129 + 22906217104 = 208877^2 + 151348^2 .

It is a cyclic number.

It is not a de Polignac number, because 66535818233 - 2⁸ = 66535817977 is a prime.

It is not a weakly prime, because it can be changed into another prime (66535818253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33267909116 + 33267909117.

It is an arithmetic number, because the mean of its divisors is an integer number (33267909117).

Almost surely, 2^66535818233 is an apocalyptic number.

It is an amenable number.

66535818233 is a deficient number, since it is larger than the sum of its proper divisors (1).

66535818233 is an equidigital number, since it uses as much as digits as its factorization.

66535818233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 50.

The spelling of 66535818233 in words is "sixty-six billion, five hundred thirty-five million, eight hundred eighteen thousand, two hundred thirty-three".