66555223 has 8 divisors (see below), whose sum is σ = 76144640. Its totient is φ = 56986200.

The previous prime is 66555199. The next prime is 66555241. The reversal of 66555223 is 32255566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66555223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66555023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2698 + ... + 11848.

It is an arithmetic number, because the mean of its divisors is an integer number (9518080).

Almost surely, 2^66555223 is an apocalyptic number.

66555223 is a deficient number, since it is larger than the sum of its proper divisors (9589417).

66555223 is a wasteful number, since it uses less digits than its factorization.

66555223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10197.

The product of its digits is 54000, while the sum is 34.

The square root of 66555223 is about 8158.1384518774. The cubic root of 66555223 is about 405.2540660588.

The spelling of 66555223 in words is "sixty-six million, five hundred fifty-five thousand, two hundred twenty-three".