66500875 has 16 divisors (see below), whose sum is σ = 94850496. Its totient is φ = 45600000.

The previous prime is 66500873. The next prime is 66500881. The reversal of 66500875 is 57800566.

It is not a de Polignac number, because 66500875 - 2¹ = 66500873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66500873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37126 + ... + 38875.

It is an arithmetic number, because the mean of its divisors is an integer number (5928156).

Almost surely, 2^66500875 is an apocalyptic number.

66500875 is a deficient number, since it is larger than the sum of its proper divisors (28349621).

66500875 is an equidigital number, since it uses as much as digits as its factorization.

66500875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76023 (or 76013 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 66500875 is about 8154.8068646658. The cubic root of 66500875 is about 405.1437278828.

The spelling of 66500875 in words is "sixty-six million, five hundred thousand, eight hundred seventy-five".