215448914861 has 2 divisors, whose sum is σ = 215448914862. Its totient is φ = 215448914860.

The previous prime is 215448914819. The next prime is 215448914893. The reversal of 215448914861 is 168419844512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206592975625 + 8855939236 = 454525^2 + 94106^2 .

It is a cyclic number.

It is not a de Polignac number, because 215448914861 - 2²⁶ = 215381805997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215448914561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107724457430 + 107724457431.

It is an arithmetic number, because the mean of its divisors is an integer number (107724457431).

Almost surely, 2^215448914861 is an apocalyptic number.

It is an amenable number.

215448914861 is a deficient number, since it is larger than the sum of its proper divisors (1).

215448914861 is an equidigital number, since it uses as much as digits as its factorization.

215448914861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2211840, while the sum is 53.

The spelling of 215448914861 in words is "two hundred fifteen billion, four hundred forty-eight million, nine hundred fourteen thousand, eight hundred sixty-one".