66727788945 has 16 divisors (see below), whose sum is σ = 111406396032. Its totient is φ = 34040842880.

The previous prime is 66727788917. The next prime is 66727788949. The reversal of 66727788945 is 54988772766.

It is not a de Polignac number, because 66727788945 - 2¹⁰ = 66727787921 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a self number, because there is not a number n which added to its sum of digits gives 66727788945.

It is not an unprimeable number, because it can be changed into a prime (66727788949) 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, 96706596 + ... + 96707285.

It is an arithmetic number, because the mean of its divisors is an integer number (6962899752).

Almost surely, 2^66727788945 is an apocalyptic number.

It is an amenable number.

66727788945 is a deficient number, since it is larger than the sum of its proper divisors (44678607087).

66727788945 is a wasteful number, since it uses less digits than its factorization.

66727788945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193413912.

The product of its digits is 284497920, while the sum is 69.

The spelling of 66727788945 in words is "sixty-six billion, seven hundred twenty-seven million, seven hundred eighty-eight thousand, nine hundred forty-five".