66855386 has 24 divisors (see below), whose sum is σ = 109448640. Its totient is φ = 30612816.

The previous prime is 66855367. The next prime is 66855391. The reversal of 66855386 is 68355866.

It is a self number, because there is not a number n which added to its sum of digits gives 66855386.

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, 46271 + ... + 47693.

It is an arithmetic number, because the mean of its divisors is an integer number (4560360).

Almost surely, 2^66855386 is an apocalyptic number.

66855386 is a deficient number, since it is larger than the sum of its proper divisors (42593254).

66855386 is a wasteful number, since it uses less digits than its factorization.

66855386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590 (or 1577 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 47.

The square root of 66855386 is about 8176.5142940008. The cubic root of 66855386 is about 405.8623822776.

The spelling of 66855386 in words is "sixty-six million, eight hundred fifty-five thousand, three hundred eighty-six".