66315689 has 4 divisors (see below), whose sum is σ = 72344400. Its totient is φ = 60286980.

The previous prime is 66315679. The next prime is 66315707. The reversal of 66315689 is 98651366.

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 66315689 - 2²⁰ = 65267113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66315619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3014339 + ... + 3014360.

It is an arithmetic number, because the mean of its divisors is an integer number (18086100).

Almost surely, 2^66315689 is an apocalyptic number.

It is an amenable number.

66315689 is a deficient number, since it is larger than the sum of its proper divisors (6028711).

66315689 is a wasteful number, since it uses less digits than its factorization.

66315689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028710.

The product of its digits is 233280, while the sum is 44.

The square root of 66315689 is about 8143.4445414702. Note that the first 3 decimals coincide. The cubic root of 66315689 is about 404.7673082882.

The spelling of 66315689 in words is "sixty-six million, three hundred fifteen thousand, six hundred eighty-nine".