65121659 has 2 divisors, whose sum is σ = 65121660. Its totient is φ = 65121658.

The previous prime is 65121631. The next prime is 65121673. The reversal of 65121659 is 95612156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65121659 - 2²⁰ = 64073083 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65121689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32560829 + 32560830.

It is an arithmetic number, because the mean of its divisors is an integer number (32560830).

Almost surely, 2^65121659 is an apocalyptic number.

65121659 is a deficient number, since it is larger than the sum of its proper divisors (1).

65121659 is an equidigital number, since it uses as much as digits as its factorization.

65121659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 65121659 is about 8069.7991920493. The cubic root of 65121659 is about 402.3232695053.

The spelling of 65121659 in words is "sixty-five million, one hundred twenty-one thousand, six hundred fifty-nine".