65633280121 has 2 divisors, whose sum is σ = 65633280122. Its totient is φ = 65633280120.

The previous prime is 65633280091. The next prime is 65633280127. The reversal of 65633280121 is 12108233656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47289286521 + 18343993600 = 217461^2 + 135440^2 .

It is a cyclic number.

It is not a de Polignac number, because 65633280121 - 2²³ = 65624891513 is a prime.

It is not a weakly prime, because it can be changed into another prime (65633280127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32816640060 + 32816640061.

It is an arithmetic number, because the mean of its divisors is an integer number (32816640061).

Almost surely, 2^65633280121 is an apocalyptic number.

It is an amenable number.

65633280121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65633280121 is an equidigital number, since it uses as much as digits as its factorization.

65633280121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 65633280121 in words is "sixty-five billion, six hundred thirty-three million, two hundred eighty thousand, one hundred twenty-one".