66185825 has 12 divisors (see below), whose sum is σ = 82256640. Its totient is φ = 52828560.

The previous prime is 66185807. The next prime is 66185827. The reversal of 66185825 is 52858166.

It is not a de Polignac number, because 66185825 - 2⁶ = 66185761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66185827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9212 + ... + 14738.

It is an arithmetic number, because the mean of its divisors is an integer number (6854720).

Almost surely, 2^66185825 is an apocalyptic number.

It is an amenable number.

66185825 is a deficient number, since it is larger than the sum of its proper divisors (16070815).

66185825 is a wasteful number, since it uses less digits than its factorization.

66185825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016 (or 6011 counting only the distinct ones).

The product of its digits is 115200, while the sum is 41.

The square root of 66185825 is about 8135.4671039836. The cubic root of 66185825 is about 404.5029211230.

The spelling of 66185825 in words is "sixty-six million, one hundred eighty-five thousand, eight hundred twenty-five".