66532223 has 4 divisors (see below), whose sum is σ = 68079528. Its totient is φ = 64984920.

The previous prime is 66532201. The next prime is 66532241. The reversal of 66532223 is 32223566.

66532223 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32223566 = 2 ⋅16111783.

It is a cyclic number.

It is not a de Polignac number, because 66532223 - 2⁶ = 66532159 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 (66535223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773588 + ... + 773673.

It is an arithmetic number, because the mean of its divisors is an integer number (17019882).

Almost surely, 2^66532223 is an apocalyptic number.

66532223 is a deficient number, since it is larger than the sum of its proper divisors (1547305).

66532223 is a wasteful number, since it uses less digits than its factorization.

66532223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547304.

The product of its digits is 12960, while the sum is 29.

The square root of 66532223 is about 8156.7286947648. The cubic root of 66532223 is about 405.2073784261.

Adding to 66532223 its reverse (32223566), we get a palindrome (98755789).

The spelling of 66532223 in words is "sixty-six million, five hundred thirty-two thousand, two hundred twenty-three".