66982175 has 24 divisors (see below), whose sum is σ = 91546224. Its totient is φ = 48303360.

The previous prime is 66982171. The next prime is 66982189. The reversal of 66982175 is 57128966.

It is not a de Polignac number, because 66982175 - 2² = 66982171 is a prime.

It is a super-2 number, since 2×66982175² = 8973223535461250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66982171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11579 + ... + 16371.

It is an arithmetic number, because the mean of its divisors is an integer number (3814426).

Almost surely, 2^66982175 is an apocalyptic number.

66982175 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66982175 is a deficient number, since it is larger than the sum of its proper divisors (24564049).

66982175 is a wasteful number, since it uses less digits than its factorization.

66982175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859 (or 4854 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 66982175 is about 8184.2638642703. The cubic root of 66982175 is about 406.1187883948.

The spelling of 66982175 in words is "sixty-six million, nine hundred eighty-two thousand, one hundred seventy-five".