778918847616 has 768 divisors, whose sum is σ = 2858675500800. Its totient is φ = 204440371200.

The previous prime is 778918847587. The next prime is 778918847617. The reversal of 778918847616 is 616748819877.

778918847616 is a `hidden beast` number, since 7 + 78 + 9 + 1 + 88 + 476 + 1 + 6 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (778918847617) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1296037716 + ... + 1296038316.

It is an arithmetic number, because the mean of its divisors is an integer number (3722233725).

Almost surely, 2^778918847616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778918847616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1429337750400).

778918847616 is an abundant number, since it is smaller than the sum of its proper divisors (2079756653184).

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

778918847616 is a wasteful number, since it uses less digits than its factorization.

778918847616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974 (or 943 counting only the distinct ones).

The product of its digits is 227598336, while the sum is 72.

The spelling of 778918847616 in words is "seven hundred seventy-eight billion, nine hundred eighteen million, eight hundred forty-seven thousand, six hundred sixteen".