66809875 has 16 divisors (see below), whose sum is σ = 90960480. Its totient is φ = 48588000.

The previous prime is 66809863. The next prime is 66809887. The reversal of 66809875 is 57890866.

It is an interprime number because it is at equal distance from previous prime (66809863) and next prime (66809887).

It is not a de Polignac number, because 66809875 - 2⁵ = 66809843 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22920 + ... + 25669.

It is an arithmetic number, because the mean of its divisors is an integer number (5685030).

Almost surely, 2^66809875 is an apocalyptic number.

66809875 is a deficient number, since it is larger than the sum of its proper divisors (24150605).

66809875 is a wasteful number, since it uses less digits than its factorization.

66809875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48615 (or 48605 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 66809875 is about 8173.7307883243. The cubic root of 66809875 is about 405.7702660602.

The spelling of 66809875 in words is "sixty-six million, eight hundred nine thousand, eight hundred seventy-five".