65447689 has 2 divisors, whose sum is σ = 65447690. Its totient is φ = 65447688.

The previous prime is 65447623. The next prime is 65447713. The reversal of 65447689 is 98674456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 242064 = 8075^2 + 492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65447689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65447089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32723844 + 32723845.

It is an arithmetic number, because the mean of its divisors is an integer number (32723845).

Almost surely, 2^65447689 is an apocalyptic number.

It is an amenable number.

65447689 is a deficient number, since it is larger than the sum of its proper divisors (1).

65447689 is an equidigital number, since it uses as much as digits as its factorization.

65447689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 49.

The square root of 65447689 is about 8089.9745982296. The cubic root of 65447689 is about 402.9935593673.

The spelling of 65447689 in words is "sixty-five million, four hundred forty-seven thousand, six hundred eighty-nine".