215855036689 has 2 divisors, whose sum is σ = 215855036690. Its totient is φ = 215855036688.

The previous prime is 215855036653. The next prime is 215855036701. The reversal of 215855036689 is 986630558512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187287276289 + 28567760400 = 432767^2 + 169020^2 .

It is a cyclic number.

It is not a de Polignac number, because 215855036689 - 2¹¹ = 215855034641 is a prime.

It is not a weakly prime, because it can be changed into another prime (215855036609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107927518344 + 107927518345.

It is an arithmetic number, because the mean of its divisors is an integer number (107927518345).

Almost surely, 2^215855036689 is an apocalyptic number.

It is an amenable number.

215855036689 is a deficient number, since it is larger than the sum of its proper divisors (1).

215855036689 is an equidigital number, since it uses as much as digits as its factorization.

215855036689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552000, while the sum is 58.

The spelling of 215855036689 in words is "two hundred fifteen billion, eight hundred fifty-five million, thirty-six thousand, six hundred eighty-nine".