65149206509 has 2 divisors, whose sum is σ = 65149206510. Its totient is φ = 65149206508.

The previous prime is 65149206467. The next prime is 65149206511. The reversal of 65149206509 is 90560294156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63486361225 + 1662845284 = 251965^2 + 40778^2 .

It is a cyclic number.

It is not a de Polignac number, because 65149206509 - 2³² = 60854239213 is a prime.

Together with 65149206511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65149206559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32574603254 + 32574603255.

It is an arithmetic number, because the mean of its divisors is an integer number (32574603255).

Almost surely, 2^65149206509 is an apocalyptic number.

It is an amenable number.

65149206509 is a deficient number, since it is larger than the sum of its proper divisors (1).

65149206509 is an equidigital number, since it uses as much as digits as its factorization.

65149206509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 65149206509 in words is "sixty-five billion, one hundred forty-nine million, two hundred six thousand, five hundred nine".