66805736 has 16 divisors (see below), whose sum is σ = 127315140. Its totient is φ = 32855040.

The previous prime is 66805727. The next prime is 66805747. The reversal of 66805736 is 63750866.

It can be written as a sum of positive squares in 2 ways, for example, as 55204900 + 11600836 = 7430^2 + 3406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66805693 and 66805702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67961 + ... + 68936.

Almost surely, 2^66805736 is an apocalyptic number.

It is an amenable number.

66805736 is a deficient number, since it is larger than the sum of its proper divisors (60509404).

66805736 is a wasteful number, since it uses less digits than its factorization.

66805736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136964 (or 136960 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66805736 is about 8173.4775952467. The cubic root of 66805736 is about 405.7618864715.

The spelling of 66805736 in words is "sixty-six million, eight hundred five thousand, seven hundred thirty-six".