778996545696 has 72 divisors (see below), whose sum is σ = 2257069045140. Its totient is φ = 254766160896.

The previous prime is 778996545653. The next prime is 778996545721. The reversal of 778996545696 is 696545699877.

778996545696 is a `hidden beast` number, since 7 + 7 + 8 + 9 + 9 + 6 + 545 + 69 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 657013998096 + 121982547600 = 810564^2 + 349260^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×778996545696² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25502181 + ... + 25532708.

Almost surely, 2^778996545696 is an apocalyptic number.

It is an amenable number.

778996545696 is an abundant number, since it is smaller than the sum of its proper divisors (1478072499444).

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

778996545696 is a wasteful number, since it uses less digits than its factorization.

778996545696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51034958 (or 51034947 counting only the distinct ones).

The product of its digits is 6172588800, while the sum is 81.

The spelling of 778996545696 in words is "seven hundred seventy-eight billion, nine hundred ninety-six million, five hundred forty-five thousand, six hundred ninety-six".