781992996840768 has 56 divisors (see below), whose sum is σ = 2158980665203008. Its totient is φ = 249331100440576.

The previous prime is 781992996840763. The next prime is 781992996840773. The reversal of 781992996840768 is 867048699299187.

It is an interprime number because it is at equal distance from previous prime (781992996840763) and next prime (781992996840773).

It is a super-2 number, since 2×781992996840768² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781992996840761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88540869321 + ... + 88540878152.

Almost surely, 2^{781992996840768} is an apocalyptic number.

It is an amenable number.

781992996840768 is an abundant number, since it is smaller than the sum of its proper divisors (1376987668362240).

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

781992996840768 is a wasteful number, since it uses less digits than its factorization.

781992996840768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177081747511 (or 177081747501 counting only the distinct ones).

The product of its (nonzero) digits is 47405481984, while the sum is 93.

The spelling of 781992996840768 in words is "seven hundred eighty-one trillion, nine hundred ninety-two billion, nine hundred ninety-six million, eight hundred forty thousand, seven hundred sixty-eight".