66685225 has 12 divisors (see below), whose sum is σ = 82869696. Its totient is φ = 53232080.

The previous prime is 66685207. The next prime is 66685249. The reversal of 66685225 is 52258666.

It is a happy number.

It is not a de Polignac number, because 66685225 - 2⁹ = 66684713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9924 + ... + 15226.

It is an arithmetic number, because the mean of its divisors is an integer number (6905808).

Almost surely, 2^66685225 is an apocalyptic number.

It is an amenable number.

66685225 is a deficient number, since it is larger than the sum of its proper divisors (16184471).

66685225 is a wasteful number, since it uses less digits than its factorization.

66685225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5811 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 66685225 is about 8166.1021913763. The cubic root of 66685225 is about 405.5177547248.

The spelling of 66685225 in words is "sixty-six million, six hundred eighty-five thousand, two hundred twenty-five".