66871975 has 6 divisors (see below), whose sum is σ = 82921280. Its totient is φ = 53497560.

The previous prime is 66871969. The next prime is 66871993. The reversal of 66871975 is 57917866.

It is not a de Polignac number, because 66871975 - 2⁹ = 66871463 is a prime.

It is a super-2 number, since 2×66871975² = 8943722080801250, which contains 22 as substring.

It is a zygodrome in base 3.

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, 1337415 + ... + 1337464.

Almost surely, 2^66871975 is an apocalyptic number.

66871975 is a deficient number, since it is larger than the sum of its proper divisors (16049305).

66871975 is a wasteful number, since it uses less digits than its factorization.

66871975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674889 (or 2674884 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 66871975 is about 8177.5286609097. The cubic root of 66871975 is about 405.8959487293.

The spelling of 66871975 in words is "sixty-six million, eight hundred seventy-one thousand, nine hundred seventy-five".