66789561233 has 4 divisors (see below), whose sum is σ = 66987750180. Its totient is φ = 66591372288.

The previous prime is 66789561229. The next prime is 66789561263. The reversal of 66789561233 is 33216598766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33019250944 + 33770310289 = 181712^2 + 183767^2 .

It is a cyclic number.

It is not a de Polignac number, because 66789561233 - 2² = 66789561229 is a prime.

It is a super-5 number, since 5×66789561233⁵ (a number of 55 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66789561263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99093968 + ... + 99094641.

It is an arithmetic number, because the mean of its divisors is an integer number (16746937545).

Almost surely, 2^66789561233 is an apocalyptic number.

It is an amenable number.

66789561233 is a deficient number, since it is larger than the sum of its proper divisors (198188947).

66789561233 is a wasteful number, since it uses less digits than its factorization.

66789561233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198188946.

The product of its digits is 9797760, while the sum is 56.

The spelling of 66789561233 in words is "sixty-six billion, seven hundred eighty-nine million, five hundred sixty-one thousand, two hundred thirty-three".