778812999383 has 2 divisors, whose sum is σ = 778812999384. Its totient is φ = 778812999382.

The previous prime is 778812999373. The next prime is 778812999389. The reversal of 778812999383 is 383999218877.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-778812999383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 778812999383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (778812999389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389406499691 + 389406499692.

It is an arithmetic number, because the mean of its divisors is an integer number (389406499692).

Almost surely, 2^778812999383 is an apocalyptic number.

778812999383 is a deficient number, since it is larger than the sum of its proper divisors (1).

778812999383 is an equidigital number, since it uses as much as digits as its factorization.

778812999383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329204736, while the sum is 74.

The spelling of 778812999383 in words is "seven hundred seventy-eight billion, eight hundred twelve million, nine hundred ninety-nine thousand, three hundred eighty-three".