51675787217 has 2 divisors, whose sum is σ = 51675787218. Its totient is φ = 51675787216.

The previous prime is 51675787201. The next prime is 51675787243. The reversal of 51675787217 is 71278757615.

51675787217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51406039441 + 269747776 = 226729^2 + 16424^2 .

It is a cyclic number.

It is not a de Polignac number, because 51675787217 - 2⁴ = 51675787201 is a prime.

It is not a weakly prime, because it can be changed into another prime (51675717217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25837893608 + 25837893609.

It is an arithmetic number, because the mean of its divisors is an integer number (25837893609).

Almost surely, 2^51675787217 is an apocalyptic number.

It is an amenable number.

51675787217 is a deficient number, since it is larger than the sum of its proper divisors (1).

51675787217 is an equidigital number, since it uses as much as digits as its factorization.

51675787217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5762400, while the sum is 56.

The spelling of 51675787217 in words is "fifty-one billion, six hundred seventy-five million, seven hundred eighty-seven thousand, two hundred seventeen".