778217009842253 has 2 divisors, whose sum is σ = 778217009842254. Its totient is φ = 778217009842252.

The previous prime is 778217009842231. The next prime is 778217009842273. The reversal of 778217009842253 is 352248900712877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599188247935684 + 179028761906569 = 24478322^2 + 13380163^2 .

It is a cyclic number.

It is not a de Polignac number, because 778217009842253 - 2²⁶ = 778216942733389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 778217009842253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778217009842273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389108504921126 + 389108504921127.

It is an arithmetic number, because the mean of its divisors is an integer number (389108504921127).

Almost surely, 2^{778217009842253} is an apocalyptic number.

It is an amenable number.

778217009842253 is a deficient number, since it is larger than the sum of its proper divisors (1).

778217009842253 is an equidigital number, since it uses as much as digits as its factorization.

778217009842253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94832640, while the sum is 65.

The spelling of 778217009842253 in words is "seven hundred seventy-eight trillion, two hundred seventeen billion, nine million, eight hundred forty-two thousand, two hundred fifty-three".