66318875 has 16 divisors (see below), whose sum is σ = 94590912. Its totient is φ = 45475200.

The previous prime is 66318871. The next prime is 66318883. The reversal of 66318875 is 57881366.

It is not a de Polignac number, because 66318875 - 2² = 66318871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66318871) 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 15 ways as a sum of consecutive naturals, for example, 37022 + ... + 38771.

It is an arithmetic number, because the mean of its divisors is an integer number (5911932).

Almost surely, 2^66318875 is an apocalyptic number.

66318875 is a deficient number, since it is larger than the sum of its proper divisors (28272037).

66318875 is an equidigital number, since it uses as much as digits as its factorization.

66318875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75815 (or 75805 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 66318875 is about 8143.6401565885. The cubic root of 66318875 is about 404.7737902535.

The spelling of 66318875 in words is "sixty-six million, three hundred eighteen thousand, eight hundred seventy-five".