66789613 has 4 divisors (see below), whose sum is σ = 72861408. Its totient is φ = 60717820.

The previous prime is 66789607. The next prime is 66789637. The reversal of 66789613 is 31698766.

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-66789613 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 (66789673) 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, 3035881 + ... + 3035902.

It is an arithmetic number, because the mean of its divisors is an integer number (18215352).

Almost surely, 2^66789613 is an apocalyptic number.

It is an amenable number.

66789613 is a deficient number, since it is larger than the sum of its proper divisors (6071795).

66789613 is a wasteful number, since it uses less digits than its factorization.

66789613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6071794.

The product of its digits is 326592, while the sum is 46.

The square root of 66789613 is about 8172.4912358472. The cubic root of 66789613 is about 405.7292414441.

The spelling of 66789613 in words is "sixty-six million, seven hundred eighty-nine thousand, six hundred thirteen".