66812 has 6 divisors (see below), whose sum is σ = 116928. Its totient is φ = 33404.

The previous prime is 66809. The next prime is 66821. The reversal of 66812 is 21866.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8348 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (19488).

2⁶⁶⁸¹² is an apocalyptic number.

It is an amenable number.

66812 is a deficient number, since it is larger than the sum of its proper divisors (50116).

66812 is a wasteful number, since it uses less digits than its factorization.

66812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16707 (or 16705 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 66812 is about 258.4801733209. The cubic root of 66812 is about 40.5774568082.

It can be divided in two parts, 66 and 812, that added together give a palindrome (878).

The spelling of 66812 in words is "sixty-six thousand, eight hundred twelve".