66938075 has 6 divisors (see below), whose sum is σ = 83003244. Its totient is φ = 53550440.

The previous prime is 66938071. The next prime is 66938077. The reversal of 66938075 is 57083966.

It is not a de Polignac number, because 66938075 - 2² = 66938071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66938071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1338737 + ... + 1338786.

It is an arithmetic number, because the mean of its divisors is an integer number (13833874).

Almost surely, 2^66938075 is an apocalyptic number.

66938075 is a deficient number, since it is larger than the sum of its proper divisors (16065169).

66938075 is a wasteful number, since it uses less digits than its factorization.

66938075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677533 (or 2677528 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 66938075 is about 8181.5692260104. The cubic root of 66938075 is about 406.0296414412.

The spelling of 66938075 in words is "sixty-six million, nine hundred thirty-eight thousand, seventy-five".