66966589 has 4 divisors (see below), whose sum is σ = 67261824. Its totient is φ = 66671356.

The previous prime is 66966577. The next prime is 66966619. The reversal of 66966589 is 98566966.

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 not a de Polignac number, because 66966589 - 2¹⁵ = 66933821 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 (66966509) 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, 147277 + ... + 147730.

It is an arithmetic number, because the mean of its divisors is an integer number (16815456).

Almost surely, 2^66966589 is an apocalyptic number.

It is an amenable number.

66966589 is a deficient number, since it is larger than the sum of its proper divisors (295235).

66966589 is a wasteful number, since it uses less digits than its factorization.

66966589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295234.

The product of its digits is 4199040, while the sum is 55.

The square root of 66966589 is about 8183.3116157214. The cubic root of 66966589 is about 406.0872861906.

The spelling of 66966589 in words is "sixty-six million, nine hundred sixty-six thousand, five hundred eighty-nine".