66774217233 has 4 divisors (see below), whose sum is σ = 89032289648. Its totient is φ = 44516144820.

The previous prime is 66774217231. The next prime is 66774217259. The reversal of 66774217233 is 33271247766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66774217233 - 2¹ = 66774217231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66774217231) 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, 11129036203 + ... + 11129036208.

It is an arithmetic number, because the mean of its divisors is an integer number (22258072412).

Almost surely, 2^66774217233 is an apocalyptic number.

It is an amenable number.

66774217233 is a deficient number, since it is larger than the sum of its proper divisors (22258072415).

66774217233 is a wasteful number, since it uses less digits than its factorization.

66774217233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22258072414.

The product of its digits is 1778112, while the sum is 48.

The spelling of 66774217233 in words is "sixty-six billion, seven hundred seventy-four million, two hundred seventeen thousand, two hundred thirty-three".