66805076 has 12 divisors (see below), whose sum is σ = 125901972. Its totient is φ = 30833088.

The previous prime is 66805073. The next prime is 66805099. The reversal of 66805076 is 67050866.

It can be written as a sum of positive squares in 2 ways, for example, as 44488900 + 22316176 = 6670^2 + 4724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66805073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 642305 + ... + 642408.

It is an arithmetic number, because the mean of its divisors is an integer number (10491831).

Almost surely, 2^66805076 is an apocalyptic number.

It is an amenable number.

66805076 is a deficient number, since it is larger than the sum of its proper divisors (59096896).

66805076 is a wasteful number, since it uses less digits than its factorization.

66805076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284730 (or 1284728 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 66805076 is about 8173.4372206557. The cubic root of 66805076 is about 405.7605502403.

The spelling of 66805076 in words is "sixty-six million, eight hundred five thousand, seventy-six".