68661866 has 16 divisors (see below), whose sum is σ = 126760704. Its totient is φ = 27162864.

The previous prime is 68661863. The next prime is 68661881. The reversal of 68661866 is 66816686.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68661866.

It is not an unprimeable number, because it can be changed into a prime (68661863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 188450 + ... + 188813.

It is an arithmetic number, because the mean of its divisors is an integer number (7922544).

Almost surely, 2^68661866 is an apocalyptic number.

68661866 is a deficient number, since it is larger than the sum of its proper divisors (58098838).

68661866 is a wasteful number, since it uses less digits than its factorization.

68661866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377285.

The product of its digits is 497664, while the sum is 47.

The square root of 68661866 is about 8286.2455913399. The cubic root of 68661866 is about 409.4855057503.

The spelling of 68661866 in words is "sixty-eight million, six hundred sixty-one thousand, eight hundred sixty-six".