66544235 has 4 divisors (see below), whose sum is σ = 79853088. Its totient is φ = 53235384.

The previous prime is 66544223. The next prime is 66544237. The reversal of 66544235 is 53244566.

It is a happy number.

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 66544235 - 2¹⁸ = 66282091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66544195 and 66544204.

It is not an unprimeable number, because it can be changed into a prime (66544237) 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, 6654419 + ... + 6654428.

It is an arithmetic number, because the mean of its divisors is an integer number (19963272).

Almost surely, 2^66544235 is an apocalyptic number.

66544235 is a deficient number, since it is larger than the sum of its proper divisors (13308853).

66544235 is a wasteful number, since it uses less digits than its factorization.

66544235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13308852.

The product of its digits is 86400, while the sum is 35.

The square root of 66544235 is about 8157.4649861339. The cubic root of 66544235 is about 405.2317628918.

The spelling of 66544235 in words is "sixty-six million, five hundred forty-four thousand, two hundred thirty-five".