215135566717 has 2 divisors, whose sum is σ = 215135566718. Its totient is φ = 215135566716.

The previous prime is 215135566643. The next prime is 215135566741. The reversal of 215135566717 is 717665531512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214692295801 + 443270916 = 463349^2 + 21054^2 .

It is a cyclic number.

It is not a de Polignac number, because 215135566717 - 2³¹ = 212988083069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215135566757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107567783358 + 107567783359.

It is an arithmetic number, because the mean of its divisors is an integer number (107567783359).

Almost surely, 2^215135566717 is an apocalyptic number.

It is an amenable number.

215135566717 is a deficient number, since it is larger than the sum of its proper divisors (1).

215135566717 is an equidigital number, since it uses as much as digits as its factorization.

215135566717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1323000, while the sum is 49.

The spelling of 215135566717 in words is "two hundred fifteen billion, one hundred thirty-five million, five hundred sixty-six thousand, seven hundred seventeen".