778825165564 has 6 divisors (see below), whose sum is σ = 1362944039744. Its totient is φ = 389412582780.

The previous prime is 778825165549. The next prime is 778825165567. The reversal of 778825165564 is 465561528877.

It is a super-2 number, since 2×778825165564² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 778825165496 and 778825165505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778825165567) 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 as a sum of consecutive naturals, namely, 97353145692 + ... + 97353145699.

Almost surely, 2^778825165564 is an apocalyptic number.

It is an amenable number.

778825165564 is a deficient number, since it is larger than the sum of its proper divisors (584118874180).

778825165564 is a wasteful number, since it uses less digits than its factorization.

778825165564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194706291395 (or 194706291393 counting only the distinct ones).

The product of its digits is 112896000, while the sum is 64.

The spelling of 778825165564 in words is "seven hundred seventy-eight billion, eight hundred twenty-five million, one hundred sixty-five thousand, five hundred sixty-four".