66555 has 32 divisors (see below), whose sum is σ = 129600. Its totient is φ = 32256.

The previous prime is 66553. The next prime is 66569. The reversal of 66555 is 55566.

66555 is a `hidden beast` number, since 6 + 655 + 5 = 666.

66555 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 66555 - 2¹ = 66553 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (4500) is a multiple of the sum of its prime factors (60).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2281 + ... + 2309.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2⁶⁶⁵⁵⁵ is an apocalyptic number.

66555 is a deficient number, since it is larger than the sum of its proper divisors (63045).

66555 is a wasteful number, since it uses less digits than its factorization.

66555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 54 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 66555 is about 257.9825575499. The cubic root of 66555 is about 40.5253613443.

It can be divided in two parts, 6 and 6555, that added together give a 8-th power (6561 = 3⁸).

The spelling of 66555 in words is "sixty-six thousand, five hundred fifty-five".