66876785 has 8 divisors (see below), whose sum is σ = 80696616. Its totient is φ = 53205120.

The previous prime is 66876769. The next prime is 66876791. The reversal of 66876785 is 58767866.

It can be written as a sum of positive squares in 4 ways, for example, as 552049 + 66324736 = 743^2 + 8144^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66876785 - 2⁴ = 66876769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 36044 + ... + 37853.

It is an arithmetic number, because the mean of its divisors is an integer number (10087077).

Almost surely, 2^66876785 is an apocalyptic number.

It is an amenable number.

66876785 is a deficient number, since it is larger than the sum of its proper divisors (13819831).

66876785 is a wasteful number, since it uses less digits than its factorization.

66876785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74083.

The product of its digits is 3386880, while the sum is 53.

The square root of 66876785 is about 8177.8227542543. The cubic root of 66876785 is about 405.9056803232.

The spelling of 66876785 in words is "sixty-six million, eight hundred seventy-six thousand, seven hundred eighty-five".