66243773 has 4 divisors (see below), whose sum is σ = 66342300. Its totient is φ = 66145248.

The previous prime is 66243767. The next prime is 66243797. The reversal of 66243773 is 37734266.

It is a happy number.

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 62758084 + 3485689 = 7922^2 + 1867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66243773 is a prime.

It is a super-2 number, since 2×66243773² = 8776474922551058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66243733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48248 + ... + 49601.

It is an arithmetic number, because the mean of its divisors is an integer number (16585575).

Almost surely, 2^66243773 is an apocalyptic number.

It is an amenable number.

66243773 is a deficient number, since it is larger than the sum of its proper divisors (98527).

66243773 is an equidigital number, since it uses as much as digits as its factorization.

66243773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98526.

The product of its digits is 127008, while the sum is 38.

The square root of 66243773 is about 8139.0277674916. The cubic root of 66243773 is about 404.6209388291.

The spelling of 66243773 in words is "sixty-six million, two hundred forty-three thousand, seven hundred seventy-three".