66197027 has 4 divisors (see below), whose sum is σ = 71289120. Its totient is φ = 61104936.

The previous prime is 66197003. The next prime is 66197029. The reversal of 66197027 is 72079166.

66197027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66197027 - 2²⁰ = 65148451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66197029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2546027 + ... + 2546052.

It is an arithmetic number, because the mean of its divisors is an integer number (17822280).

Almost surely, 2^66197027 is an apocalyptic number.

66197027 is a deficient number, since it is larger than the sum of its proper divisors (5092093).

66197027 is a wasteful number, since it uses less digits than its factorization.

66197027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092092.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 66197027 is about 8136.1555417777. The cubic root of 66197027 is about 404.5257406422.

The spelling of 66197027 in words is "sixty-six million, one hundred ninety-seven thousand, twenty-seven".