66985175 has 6 divisors (see below), whose sum is σ = 83061648. Its totient is φ = 53588120.

The previous prime is 66985169. The next prime is 66985183. The reversal of 66985175 is 57158966.

It is not a de Polignac number, because 66985175 - 2⁴ = 66985159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1339679 + ... + 1339728.

It is an arithmetic number, because the mean of its divisors is an integer number (13843608).

Almost surely, 2^66985175 is an apocalyptic number.

66985175 is a deficient number, since it is larger than the sum of its proper divisors (16076473).

66985175 is a wasteful number, since it uses less digits than its factorization.

66985175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679417 (or 2679412 counting only the distinct ones).

The product of its digits is 453600, while the sum is 47.

The square root of 66985175 is about 8184.4471407664. The cubic root of 66985175 is about 406.1248513917.

The spelling of 66985175 in words is "sixty-six million, nine hundred eighty-five thousand, one hundred seventy-five".