66883367585 has 4 divisors (see below), whose sum is σ = 80260041108. Its totient is φ = 53506694064.

The previous prime is 66883367581. The next prime is 66883367599. The reversal of 66883367585 is 58576338866.

66883367585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20068688896 + 46814678689 = 141664^2 + 216367^2 .

It is a cyclic number.

It is not a de Polignac number, because 66883367585 - 2² = 66883367581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66883367581) 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, 6688336754 + ... + 6688336763.

It is an arithmetic number, because the mean of its divisors is an integer number (20065010277).

Almost surely, 2^66883367585 is an apocalyptic number.

It is an amenable number.

66883367585 is a deficient number, since it is larger than the sum of its proper divisors (13376673523).

66883367585 is a wasteful number, since it uses less digits than its factorization.

66883367585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13376673522.

The product of its digits is 174182400, while the sum is 65.

The spelling of 66883367585 in words is "sixty-six billion, eight hundred eighty-three million, three hundred sixty-seven thousand, five hundred eighty-five".