66045523 has 4 divisors (see below), whose sum is σ = 66072160. Its totient is φ = 66018888.

The previous prime is 66045521. The next prime is 66045533. The reversal of 66045523 is 32554066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66045523 - 2¹ = 66045521 is a prime.

It is a super-2 number, since 2×66045523² = 8724022216687058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66045521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9168 + ... + 14701.

It is an arithmetic number, because the mean of its divisors is an integer number (16518040).

Almost surely, 2^66045523 is an apocalyptic number.

66045523 is a deficient number, since it is larger than the sum of its proper divisors (26637).

66045523 is a wasteful number, since it uses less digits than its factorization.

66045523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26636.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66045523 is about 8126.8396686535. The cubic root of 66045523 is about 404.2168945312.

Adding to 66045523 its reverse (32554066), we get a palindrome (98599589).

The spelling of 66045523 in words is "sixty-six million, forty-five thousand, five hundred twenty-three".