65380879009 has 2 divisors, whose sum is σ = 65380879010. Its totient is φ = 65380879008.

The previous prime is 65380879007. The next prime is 65380879013. The reversal of 65380879009 is 90097808356.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63625017600 + 1755861409 = 252240^2 + 41903^2 .

It is a cyclic number.

It is not a de Polignac number, because 65380879009 - 2¹ = 65380879007 is a prime.

Together with 65380879007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65380879007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32690439504 + 32690439505.

It is an arithmetic number, because the mean of its divisors is an integer number (32690439505).

Almost surely, 2^65380879009 is an apocalyptic number.

It is an amenable number.

65380879009 is a deficient number, since it is larger than the sum of its proper divisors (1).

65380879009 is an equidigital number, since it uses as much as digits as its factorization.

65380879009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 65380879009 in words is "sixty-five billion, three hundred eighty million, eight hundred seventy-nine thousand, nine".