66764089 has 4 divisors (see below), whose sum is σ = 76301824. Its totient is φ = 57226356.

The previous prime is 66764077. The next prime is 66764099. The reversal of 66764089 is 98046766.

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 66764089 - 2¹¹ = 66762041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66764029) 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, 4768857 + ... + 4768870.

It is an arithmetic number, because the mean of its divisors is an integer number (19075456).

Almost surely, 2^66764089 is an apocalyptic number.

It is an amenable number.

66764089 is a deficient number, since it is larger than the sum of its proper divisors (9537735).

66764089 is an equidigital number, since it uses as much as digits as its factorization.

66764089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9537734.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 66764089 is about 8170.9295064882. The cubic root of 66764089 is about 405.6775510082.

The spelling of 66764089 in words is "sixty-six million, seven hundred sixty-four thousand, eighty-nine".