66905095689 has 16 divisors (see below), whose sum is σ = 99616752000. Its totient is φ = 44379255888.

The previous prime is 66905095687. The next prime is 66905095717. The reversal of 66905095689 is 98659050966.

66905095689 is a `hidden beast` number, since 6 + 69 + 0 + 5 + 0 + 9 + 568 + 9 = 666.

It is not a de Polignac number, because 66905095689 - 2¹ = 66905095687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66905095687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6220674 + ... + 6231419.

It is an arithmetic number, because the mean of its divisors is an integer number (6226047000).

Almost surely, 2^66905095689 is an apocalyptic number.

It is an amenable number.

66905095689 is a deficient number, since it is larger than the sum of its proper divisors (32711656311).

66905095689 is a wasteful number, since it uses less digits than its factorization.

66905095689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452301 (or 12452295 counting only the distinct ones).

The product of its (nonzero) digits is 31492800, while the sum is 63.

The spelling of 66905095689 in words is "sixty-six billion, nine hundred five million, ninety-five thousand, six hundred eighty-nine".