66133789 has 4 divisors (see below), whose sum is σ = 66154624. Its totient is φ = 66112956.

The previous prime is 66133783. The next prime is 66133801. The reversal of 66133789 is 98733166.

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-66133789 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 (66133783) 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, 4557 + ... + 12370.

It is an arithmetic number, because the mean of its divisors is an integer number (16538656).

Almost surely, 2^66133789 is an apocalyptic number.

It is an amenable number.

66133789 is a deficient number, since it is larger than the sum of its proper divisors (20835).

66133789 is a wasteful number, since it uses less digits than its factorization.

66133789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20834.

The product of its digits is 163296, while the sum is 43.

The square root of 66133789 is about 8132.2683797327. The cubic root of 66133789 is about 404.3968851621.

The spelling of 66133789 in words is "sixty-six million, one hundred thirty-three thousand, seven hundred eighty-nine".