66671887585 has 16 divisors (see below), whose sum is σ = 84399860160. Its totient is φ = 50420629440.

The previous prime is 66671887561. The next prime is 66671887591. The reversal of 66671887585 is 58578817666.

66671887585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66671887585 - 2³³ = 58081952993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66671887585.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717387 + ... + 804976.

It is an arithmetic number, because the mean of its divisors is an integer number (5274991260).

Almost surely, 2^66671887585 is an apocalyptic number.

It is an amenable number.

66671887585 is a deficient number, since it is larger than the sum of its proper divisors (17727972575).

66671887585 is a wasteful number, since it uses less digits than its factorization.

66671887585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522848.

The product of its digits is 135475200, while the sum is 67.

The spelling of 66671887585 in words is "sixty-six billion, six hundred seventy-one million, eight hundred eighty-seven thousand, five hundred eighty-five".