66464689 has 4 divisors (see below), whose sum is σ = 66498624. Its totient is φ = 66430756.

The previous prime is 66464683. The next prime is 66464701. The reversal of 66464689 is 98646466.

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 66464689 - 2³ = 66464681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66464681) 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, 13837 + ... + 18010.

It is an arithmetic number, because the mean of its divisors is an integer number (16624656).

Almost surely, 2^66464689 is an apocalyptic number.

It is an amenable number.

66464689 is a deficient number, since it is larger than the sum of its proper divisors (33935).

66464689 is a wasteful number, since it uses less digits than its factorization.

66464689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33934.

The product of its digits is 1492992, while the sum is 49.

The square root of 66464689 is about 8152.5878713449. The cubic root of 66464689 is about 405.0702291462.

The spelling of 66464689 in words is "sixty-six million, four hundred sixty-four thousand, six hundred eighty-nine".