778523885568 has 960 divisors, whose sum is σ = 2804393840640. Its totient is φ = 210213273600.

The previous prime is 778523885551. The next prime is 778523885603. The reversal of 778523885568 is 865588325877.

It is a happy number.

778523885568 is a `hidden beast` number, since 7 + 7 + 8 + 52 + 3 + 8 + 8 + 5 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 778523885496 and 778523885505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1961017146 + ... + 1961017542.

It is an arithmetic number, because the mean of its divisors is an integer number (2921243584).

Almost surely, 2^778523885568 is an apocalyptic number.

778523885568 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778523885568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1402196920320).

778523885568 is an abundant number, since it is smaller than the sum of its proper divisors (2025869955072).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778523885568 is a wasteful number, since it uses less digits than its factorization.

778523885568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 457 counting only the distinct ones).

The product of its digits is 903168000, while the sum is 72.

The spelling of 778523885568 in words is "seven hundred seventy-eight billion, five hundred twenty-three million, eight hundred eighty-five thousand, five hundred sixty-eight".