51787678716 has 18 divisors (see below), whose sum is σ = 130907743512. Its totient is φ = 17262559560.

The previous prime is 51787678699. The next prime is 51787678717. The reversal of 51787678716 is 61787678715.

51787678716 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51787678717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 719273280 + ... + 719273351.

Almost surely, 2^51787678716 is an apocalyptic number.

It is an amenable number.

51787678716 is an abundant number, since it is smaller than the sum of its proper divisors (79120064796).

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

51787678716 is a wasteful number, since it uses less digits than its factorization.

51787678716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1438546641 (or 1438546636 counting only the distinct ones).

The product of its digits is 27659520, while the sum is 63.

Subtracting 51787678716 from its reverse (61787678715), we obtain a palindrome (9999999999).

The spelling of 51787678716 in words is "fifty-one billion, seven hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred sixteen".