66087871 has 4 divisors (see below), whose sum is σ = 69566200. Its totient is φ = 62609544.

The previous prime is 66087869. The next prime is 66087893. The reversal of 66087871 is 17878066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66087871 - 2¹ = 66087869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66087821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1739136 + ... + 1739173.

It is an arithmetic number, because the mean of its divisors is an integer number (17391550).

Almost surely, 2^66087871 is an apocalyptic number.

66087871 is a deficient number, since it is larger than the sum of its proper divisors (3478329).

66087871 is a wasteful number, since it uses less digits than its factorization.

66087871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3478328.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 66087871 is about 8129.4446919823. Note that the first 3 decimals coincide. The cubic root of 66087871 is about 404.3032699026.

The spelling of 66087871 in words is "sixty-six million, eighty-seven thousand, eight hundred seventy-one".