66116243 has 4 divisors (see below), whose sum is σ = 66393120. Its totient is φ = 65839368.

The previous prime is 66116233. The next prime is 66116287. The reversal of 66116243 is 34261166.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34261166 = 2 ⋅17130583.

It is a cyclic number.

It is not a de Polignac number, because 66116243 - 2⁴ = 66116227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66116233) 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, 138080 + ... + 138557.

It is an arithmetic number, because the mean of its divisors is an integer number (16598280).

Almost surely, 2^66116243 is an apocalyptic number.

66116243 is a deficient number, since it is larger than the sum of its proper divisors (276877).

66116243 is a wasteful number, since it uses less digits than its factorization.

66116243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276876.

The product of its digits is 5184, while the sum is 29.

The square root of 66116243 is about 8131.1895193754. The cubic root of 66116243 is about 404.3611183957.

The spelling of 66116243 in words is "sixty-six million, one hundred sixteen thousand, two hundred forty-three".