66197285 has 64 divisors (see below), whose sum is σ = 105408000. Its totient is φ = 39842880.

The previous prime is 66197281. The next prime is 66197293. The reversal of 66197285 is 58279166.

It is not a de Polignac number, because 66197285 - 2² = 66197281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66197281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2282651 + ... + 2282679.

It is an arithmetic number, because the mean of its divisors is an integer number (1647000).

Almost surely, 2^66197285 is an apocalyptic number.

It is an amenable number.

66197285 is a deficient number, since it is larger than the sum of its proper divisors (39210715).

66197285 is an equidigital number, since it uses as much as digits as its factorization.

66197285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 52 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 66197285 is about 8136.1713969164. The cubic root of 66197285 is about 404.5262661820.

The spelling of 66197285 in words is "sixty-six million, one hundred ninety-seven thousand, two hundred eighty-five".