65649539 has 2 divisors, whose sum is σ = 65649540. Its totient is φ = 65649538.

The previous prime is 65649527. The next prime is 65649593. The reversal of 65649539 is 93594656.

Together with next prime (65649593) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65649539 - 2⁴ = 65649523 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 65649493 and 65649502.

It is not a weakly prime, because it can be changed into another prime (65649509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32824769 + 32824770.

It is an arithmetic number, because the mean of its divisors is an integer number (32824770).

Almost surely, 2^65649539 is an apocalyptic number.

65649539 is a deficient number, since it is larger than the sum of its proper divisors (1).

65649539 is an equidigital number, since it uses as much as digits as its factorization.

65649539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 47.

The square root of 65649539 is about 8102.4403114124. The cubic root of 65649539 is about 403.4074307020.

The spelling of 65649539 in words is "sixty-five million, six hundred forty-nine thousand, five hundred thirty-nine".