66915 has 12 divisors (see below), whose sum is σ = 116064. Its totient is φ = 35664.

The previous prime is 66889. The next prime is 66919. The reversal of 66915 is 51966.

It is not a de Polignac number, because 66915 - 2⁵ = 66883 is a prime.

66915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (66919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 699 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (9672).

2⁶⁶⁹¹⁵ is an apocalyptic number.

66915 is a deficient number, since it is larger than the sum of its proper divisors (49149).

66915 is a wasteful number, since it uses less digits than its factorization.

66915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1495 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 66915 is about 258.6793381776. The cubic root of 66915 is about 40.5982980351.

The spelling of 66915 in words is "sixty-six thousand, nine hundred fifteen".