66198727 has 4 divisors (see below), whose sum is σ = 75655696. Its totient is φ = 56741760.

The previous prime is 66198721. The next prime is 66198757. The reversal of 66198727 is 72789166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72789166 = 2 ⋅36394583.

It is a cyclic number.

It is not a de Polignac number, because 66198727 - 2³ = 66198719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66198721) 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, 4728474 + ... + 4728487.

It is an arithmetic number, because the mean of its divisors is an integer number (18913924).

Almost surely, 2^66198727 is an apocalyptic number.

66198727 is a deficient number, since it is larger than the sum of its proper divisors (9456969).

66198727 is an equidigital number, since it uses as much as digits as its factorization.

66198727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9456968.

The product of its digits is 254016, while the sum is 46.

The square root of 66198727 is about 8136.2600130527. The cubic root of 66198727 is about 404.5292034758.

The spelling of 66198727 in words is "sixty-six million, one hundred ninety-eight thousand, seven hundred twenty-seven".