66775 has 6 divisors (see below), whose sum is σ = 82832. Its totient is φ = 53400.

The previous prime is 66763. The next prime is 66791. The reversal of 66775 is 57766.

It is a de Polignac number, because none of the positive numbers 2^k-66775 is a prime.

It is a Duffinian number.

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, 1311 + ... + 1360.

2⁶⁶⁷⁷⁵ is an apocalyptic number.

66775 is a deficient number, since it is larger than the sum of its proper divisors (16057).

66775 is a wasteful number, since it uses less digits than its factorization.

66775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2676 counting only the distinct ones).

The product of its digits is 8820, while the sum is 31.

The square root of 66775 is about 258.4085911885. The cubic root of 66775 is about 40.5699649249.

Subtracting from 66775 its reverse (57766), we obtain a palindrome (9009).

It can be divided in two parts, 66 and 775, that added together give a square (841 = 29²).

The spelling of 66775 in words is "sixty-six thousand, seven hundred seventy-five".