778138518783 has 32 divisors (see below), whose sum is σ = 1072479792384. Its totient is φ = 501519200000.

The previous prime is 778138518769. The next prime is 778138518797. The reversal of 778138518783 is 387815831877.

It is an interprime number because it is at equal distance from previous prime (778138518769) and next prime (778138518797).

It is a cyclic number.

It is not a de Polignac number, because 778138518783 - 2¹⁰ = 778138517759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778138518733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11260768 + ... + 11329658.

It is an arithmetic number, because the mean of its divisors is an integer number (33514993512).

Almost surely, 2^778138518783 is an apocalyptic number.

778138518783 is a deficient number, since it is larger than the sum of its proper divisors (294341273601).

778138518783 is a wasteful number, since it uses less digits than its factorization.

778138518783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69767.

The product of its digits is 63221760, while the sum is 66.

It can be divided in two parts, 778138 and 518783, that added together give a palindrome (1296921).

The spelling of 778138518783 in words is "seven hundred seventy-eight billion, one hundred thirty-eight million, five hundred eighteen thousand, seven hundred eighty-three".