66344974789 has 4 divisors (see below), whose sum is σ = 66363250240. Its totient is φ = 66326699340.

The previous prime is 66344974771. The next prime is 66344974811. The reversal of 66344974789 is 98747944366.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66344974789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66344974739) 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, 9132279 + ... + 9139540.

It is an arithmetic number, because the mean of its divisors is an integer number (16590812560).

Almost surely, 2^66344974789 is an apocalyptic number.

It is an amenable number.

66344974789 is a deficient number, since it is larger than the sum of its proper divisors (18275451).

66344974789 is a wasteful number, since it uses less digits than its factorization.

66344974789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18275450.

The product of its digits is 219469824, while the sum is 67.

The spelling of 66344974789 in words is "sixty-six billion, three hundred forty-four million, nine hundred seventy-four thousand, seven hundred eighty-nine".