66566552273 has 4 divisors (see below), whose sum is σ = 71687056308. Its totient is φ = 61446048240.

The previous prime is 66566552257. The next prime is 66566552323. The reversal of 66566552273 is 37225566566.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37045470784 + 29521081489 = 192472^2 + 171817^2 .

It is a cyclic number.

It is not a de Polignac number, because 66566552273 - 2⁴ = 66566552257 is a prime.

It is a super-2 number, since 2×66566552273² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66566552473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2560251998 + ... + 2560252023.

It is an arithmetic number, because the mean of its divisors is an integer number (17921764077).

Almost surely, 2^66566552273 is an apocalyptic number.

It is an amenable number.

66566552273 is a deficient number, since it is larger than the sum of its proper divisors (5120504035).

66566552273 is a wasteful number, since it uses less digits than its factorization.

66566552273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120504034.

The product of its digits is 13608000, while the sum is 53.

The spelling of 66566552273 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, two hundred seventy-three".