215543311013 has 2 divisors, whose sum is σ = 215543311014. Its totient is φ = 215543311012.

The previous prime is 215543310979. The next prime is 215543311019. The reversal of 215543311013 is 310113345512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198896376484 + 16646934529 = 445978^2 + 129023^2 .

It is a cyclic number.

It is not a de Polignac number, because 215543311013 - 2⁶ = 215543310949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215543311019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107771655506 + 107771655507.

It is an arithmetic number, because the mean of its divisors is an integer number (107771655507).

Almost surely, 2^215543311013 is an apocalyptic number.

It is an amenable number.

215543311013 is a deficient number, since it is larger than the sum of its proper divisors (1).

215543311013 is an equidigital number, since it uses as much as digits as its factorization.

215543311013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 215543311013 its reverse (310113345512), we get a palindrome (525656656525).

The spelling of 215543311013 in words is "two hundred fifteen billion, five hundred forty-three million, three hundred eleven thousand, thirteen".