71666275 has 18 divisors (see below), whose sum is σ = 92915060. Its totient is φ = 54830160.

The previous prime is 71666239. The next prime is 71666293. The reversal of 71666275 is 57266617.

It is a happy number.

It is not a de Polignac number, because 71666275 - 2¹⁷ = 71535203 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10516 + ... + 15934.

Almost surely, 2^71666275 is an apocalyptic number.

71666275 is a deficient number, since it is larger than the sum of its proper divisors (21248785).

71666275 is a wasteful number, since it uses less digits than its factorization.

71666275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475 (or 5447 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The square root of 71666275 is about 8465.5935999787. The cubic root of 71666275 is about 415.3730134417.

The spelling of 71666275 in words is "seventy-one million, six hundred sixty-six thousand, two hundred seventy-five".