215885736109 has 2 divisors, whose sum is σ = 215885736110. Its totient is φ = 215885736108.

The previous prime is 215885736071. The next prime is 215885736127. The reversal of 215885736109 is 901637588512.

215885736109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180446544100 + 35439192009 = 424790^2 + 188253^2 .

It is a cyclic number.

It is not a de Polignac number, because 215885736109 - 2³¹ = 213738252461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215885736109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215885736139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107942868054 + 107942868055.

It is an arithmetic number, because the mean of its divisors is an integer number (107942868055).

Almost surely, 2^215885736109 is an apocalyptic number.

It is an amenable number.

215885736109 is a deficient number, since it is larger than the sum of its proper divisors (1).

215885736109 is an equidigital number, since it uses as much as digits as its factorization.

215885736109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 215885736109 in words is "two hundred fifteen billion, eight hundred eighty-five million, seven hundred thirty-six thousand, one hundred nine".