66993075 has 30 divisors (see below), whose sum is σ = 124098084. Its totient is φ = 35728560.

The previous prime is 66993037. The next prime is 66993083. The reversal of 66993075 is 57039966.

It is not a de Polignac number, because 66993075 - 2⁸ = 66992819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66993075.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 14517 + ... + 18566.

Almost surely, 2^66993075 is an apocalyptic number.

66993075 is a deficient number, since it is larger than the sum of its proper divisors (57105009).

66993075 is a wasteful number, since it uses less digits than its factorization.

66993075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33105 (or 33091 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 66993075 is about 8184.9297492404. The cubic root of 66993075 is about 406.1408164179.

The spelling of 66993075 in words is "sixty-six million, nine hundred ninety-three thousand, seventy-five".