66564743273 has 16 divisors (see below), whose sum is σ = 79522037760. Its totient is φ = 54516056400.

The previous prime is 66564743269. The next prime is 66564743291. The reversal of 66564743273 is 37234746566.

It is a cyclic number.

It is not a de Polignac number, because 66564743273 - 2² = 66564743269 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66564743293) 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, 1924313 + ... + 1958598.

It is an arithmetic number, because the mean of its divisors is an integer number (4970127360).

Almost surely, 2^66564743273 is an apocalyptic number.

It is an amenable number.

66564743273 is a deficient number, since it is larger than the sum of its proper divisors (12957294487).

66564743273 is a wasteful number, since it uses less digits than its factorization.

66564743273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883028.

The product of its digits is 15240960, while the sum is 53.

The spelling of 66564743273 in words is "sixty-six billion, five hundred sixty-four million, seven hundred forty-three thousand, two hundred seventy-three".