215205662421613 has 2 divisors, whose sum is σ = 215205662421614. Its totient is φ = 215205662421612.

The previous prime is 215205662421599. The next prime is 215205662421683. The reversal of 215205662421613 is 316124266502512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215031194979364 + 174467442249 = 14663942^2 + 417693^2 .

It is a cyclic number.

It is not a de Polignac number, because 215205662421613 - 2²¹ = 215205660324461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215205662421683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107602831210806 + 107602831210807.

It is an arithmetic number, because the mean of its divisors is an integer number (107602831210807).

Almost surely, 2^{215205662421613} is an apocalyptic number.

It is an amenable number.

215205662421613 is a deficient number, since it is larger than the sum of its proper divisors (1).

215205662421613 is an equidigital number, since it uses as much as digits as its factorization.

215205662421613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 215205662421613 in words is "two hundred fifteen trillion, two hundred five billion, six hundred sixty-two million, four hundred twenty-one thousand, six hundred thirteen".