65663243 has 4 divisors (see below), whose sum is σ = 65919000. Its totient is φ = 65407488.

The previous prime is 65663233. The next prime is 65663249. The reversal of 65663243 is 34236656.

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 65663243 - 2⁶ = 65663179 is a prime.

It is a super-2 number, since 2×65663243² = 8623322962554098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65663249) 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, 127493 + ... + 128006.

It is an arithmetic number, because the mean of its divisors is an integer number (16479750).

Almost surely, 2^65663243 is an apocalyptic number.

65663243 is a deficient number, since it is larger than the sum of its proper divisors (255757).

65663243 is a wasteful number, since it uses less digits than its factorization.

65663243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255756.

The product of its digits is 77760, while the sum is 35.

The square root of 65663243 is about 8103.2859384326. The cubic root of 65663243 is about 403.4354984838.

Adding to 65663243 its reverse (34236656), we get a palindrome (99899899).

The spelling of 65663243 in words is "sixty-five million, six hundred sixty-three thousand, two hundred forty-three".