66810746 has 8 divisors (see below), whose sum is σ = 100255860. Its totient is φ = 33392128.

The previous prime is 66810727. The next prime is 66810749. The reversal of 66810746 is 64701866.

It can be written as a sum of positive squares in 2 ways, for example, as 63027721 + 3783025 = 7939^2 + 1945^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66810749) by changing a digit.

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, 1850 + ... + 11706.

Almost surely, 2^66810746 is an apocalyptic number.

66810746 is a deficient number, since it is larger than the sum of its proper divisors (33445114).

66810746 is a wasteful number, since it uses less digits than its factorization.

66810746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66810746 is about 8173.7840685939. The cubic root of 66810746 is about 405.7720293942.

The spelling of 66810746 in words is "sixty-six million, eight hundred ten thousand, seven hundred forty-six".