778217009842231 has 2 divisors, whose sum is σ = 778217009842232. Its totient is φ = 778217009842230.

The previous prime is 778217009842211. The next prime is 778217009842253. The reversal of 778217009842231 is 132248900712877.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 778217009842231 - 2⁵ = 778217009842199 is a prime.

It is a super-2 number, since 2×778217009842231² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 778217009842231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778217009842211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389108504921115 + 389108504921116.

It is an arithmetic number, because the mean of its divisors is an integer number (389108504921116).

Almost surely, 2^{778217009842231} is an apocalyptic number.

778217009842231 is a deficient number, since it is larger than the sum of its proper divisors (1).

778217009842231 is an equidigital number, since it uses as much as digits as its factorization.

778217009842231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 778217009842231 in words is "seven hundred seventy-eight trillion, two hundred seventeen billion, nine million, eight hundred forty-two thousand, two hundred thirty-one".