136666856 has 16 divisors (see below), whose sum is σ = 256727040. Its totient is φ = 68206320.

The previous prime is 136666819. The next prime is 136666903. The reversal of 136666856 is 658666631.

It is a self number, because there is not a number n which added to its sum of digits gives 136666856.

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 3 ways as a sum of consecutive naturals, for example, 11240 + ... + 19991.

It is an arithmetic number, because the mean of its divisors is an integer number (16045440).

Almost surely, 2^136666856 is an apocalyptic number.

It is an amenable number.

136666856 is a deficient number, since it is larger than the sum of its proper divisors (120060184).

136666856 is a wasteful number, since it uses less digits than its factorization.

136666856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31784 (or 31780 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 136666856 is about 11690.4600422738. The cubic root of 136666856 is about 515.0954748054.

The spelling of 136666856 in words is "one hundred thirty-six million, six hundred sixty-six thousand, eight hundred fifty-six".