66621186 has 24 divisors (see below), whose sum is σ = 144583920. Its totient is φ = 22170456.

The previous prime is 66621169. The next prime is 66621199. The reversal of 66621186 is 68112666.

66621186 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66621186.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9585 + ... + 15003.

It is an arithmetic number, because the mean of its divisors is an integer number (6024330).

Almost surely, 2^66621186 is an apocalyptic number.

66621186 is an abundant number, since it is smaller than the sum of its proper divisors (77962734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66621186 is a wasteful number, since it uses less digits than its factorization.

66621186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6110 (or 6107 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 66621186 is about 8162.1802234452. The cubic root of 66621186 is about 405.3879045281.

The spelling of 66621186 in words is "sixty-six million, six hundred twenty-one thousand, one hundred eighty-six".