66869727 has 4 divisors (see below), whose sum is σ = 89159640. Its totient is φ = 44579816.

The previous prime is 66869723. The next prime is 66869741. The reversal of 66869727 is 72796866.

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

It is a cyclic number.

It is not a de Polignac number, because 66869727 - 2² = 66869723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66869727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66869723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11144952 + ... + 11144957.

It is an arithmetic number, because the mean of its divisors is an integer number (22289910).

Almost surely, 2^66869727 is an apocalyptic number.

66869727 is a deficient number, since it is larger than the sum of its proper divisors (22289913).

66869727 is a wasteful number, since it uses less digits than its factorization.

66869727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22289912.

The product of its digits is 1524096, while the sum is 51.

The square root of 66869727 is about 8177.3912099153. The cubic root of 66869727 is about 405.8914004149.

The spelling of 66869727 in words is "sixty-six million, eight hundred sixty-nine thousand, seven hundred twenty-seven".