778048652168 has 16 divisors (see below), whose sum is σ = 1466246511180. Its totient is φ = 387049582528.

The previous prime is 778048652167. The next prime is 778048652203. The reversal of 778048652168 is 861256840877.

It can be written as a sum of positive squares in 2 ways, for example, as 462206900164 + 315841752004 = 679858^2 + 561998^2 .

It is a super-2 number, since 2×778048652168² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 778048652168.

It is not an unprimeable number, because it can be changed into a prime (778048652167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246841271 + ... + 246844422.

Almost surely, 2^778048652168 is an apocalyptic number.

It is an amenable number.

778048652168 is a deficient number, since it is larger than the sum of its proper divisors (688197859012).

778048652168 is a wasteful number, since it uses less digits than its factorization.

778048652168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493685896 (or 493685892 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 778048652168 in words is "seven hundred seventy-eight billion, forty-eight million, six hundred fifty-two thousand, one hundred sixty-eight".