51426145217 has 2 divisors, whose sum is σ = 51426145218. Its totient is φ = 51426145216.

The previous prime is 51426145201. The next prime is 51426145261. The reversal of 51426145217 is 71254162415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36513095056 + 14913050161 = 191084^2 + 122119^2 .

It is a cyclic number.

It is not a de Polignac number, because 51426145217 - 2⁴ = 51426145201 is a prime.

It is not a weakly prime, because it can be changed into another prime (51426145297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25713072608 + 25713072609.

It is an arithmetic number, because the mean of its divisors is an integer number (25713072609).

Almost surely, 2^51426145217 is an apocalyptic number.

It is an amenable number.

51426145217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51426145217 is an equidigital number, since it uses as much as digits as its factorization.

51426145217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The spelling of 51426145217 in words is "fifty-one billion, four hundred twenty-six million, one hundred forty-five thousand, two hundred seventeen".