65999249 has 2 divisors, whose sum is σ = 65999250. Its totient is φ = 65999248.

The previous prime is 65999243. The next prime is 65999251. The reversal of 65999249 is 94299956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 19963024 = 6785^2 + 4468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65999249 is a prime.

Together with 65999251, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65999249.

It is not a weakly prime, because it can be changed into another prime (65999243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32999624 + 32999625.

It is an arithmetic number, because the mean of its divisors is an integer number (32999625).

Almost surely, 2^65999249 is an apocalyptic number.

It is an amenable number.

65999249 is a deficient number, since it is larger than the sum of its proper divisors (1).

65999249 is an equidigital number, since it uses as much as digits as its factorization.

65999249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 53.

The square root of 65999249 is about 8123.9921836496. The cubic root of 65999249 is about 404.1224692426.

The spelling of 65999249 in words is "sixty-five million, nine hundred ninety-nine thousand, two hundred forty-nine".