215556304344229 has 2 divisors, whose sum is σ = 215556304344230. Its totient is φ = 215556304344228.

The previous prime is 215556304344223. The next prime is 215556304344253. The reversal of 215556304344229 is 922443403655512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198607068211204 + 16949236133025 = 14092802^2 + 4116945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215556304344229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215556304344229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215556304344223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107778152172114 + 107778152172115.

It is an arithmetic number, because the mean of its divisors is an integer number (107778152172115).

Almost surely, 2^{215556304344229} is an apocalyptic number.

It is an amenable number.

215556304344229 is a deficient number, since it is larger than the sum of its proper divisors (1).

215556304344229 is an equidigital number, since it uses as much as digits as its factorization.

215556304344229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104000, while the sum is 55.

The spelling of 215556304344229 in words is "two hundred fifteen trillion, five hundred fifty-six billion, three hundred four million, three hundred forty-four thousand, two hundred twenty-nine".