66318075 has 48 divisors (see below), whose sum is σ = 128265600. Its totient is φ = 33501600.

The previous prime is 66318073. The next prime is 66318089. The reversal of 66318075 is 57081366.

It is not a de Polignac number, because 66318075 - 2¹ = 66318073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66318073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10240 + ... + 15410.

It is an arithmetic number, because the mean of its divisors is an integer number (2672200).

Almost surely, 2^66318075 is an apocalyptic number.

66318075 is a deficient number, since it is larger than the sum of its proper divisors (61947525).

66318075 is a wasteful number, since it uses less digits than its factorization.

66318075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5209 (or 5198 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 66318075 is about 8143.5910383565. The cubic root of 66318075 is about 404.7721626609.

It can be divided in two parts, 6631 and 8075, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 66318075 in words is "sixty-six million, three hundred eighteen thousand, seventy-five".