51645401622209 has 2 divisors, whose sum is σ = 51645401622210. Its totient is φ = 51645401622208.

The previous prime is 51645401621963. The next prime is 51645401622263. The reversal of 51645401622209 is 90222610454615.

51645401622209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32151984553984 + 19493417068225 = 5670272^2 + 4415135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51645401622209 is a prime.

It is not a weakly prime, because it can be changed into another prime (51645701622209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822700811104 + 25822700811105.

It is an arithmetic number, because the mean of its divisors is an integer number (25822700811105).

Almost surely, 2^{51645401622209} is an apocalyptic number.

It is an amenable number.

51645401622209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645401622209 is an equidigital number, since it uses as much as digits as its factorization.

51645401622209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 51645401622209 in words is "fifty-one trillion, six hundred forty-five billion, four hundred one million, six hundred twenty-two thousand, two hundred nine".