51787678713 has 4 divisors (see below), whose sum is σ = 69050238288. Its totient is φ = 34525119140.

The previous prime is 51787678699. The next prime is 51787678717. The reversal of 51787678713 is 31787678715.

51787678713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51787678713 - 2³² = 47492711417 is a prime.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 8631279783 + ... + 8631279788.

It is an arithmetic number, because the mean of its divisors is an integer number (17262559572).

Almost surely, 2^51787678713 is an apocalyptic number.

It is an amenable number.

51787678713 is a deficient number, since it is larger than the sum of its proper divisors (17262559575).

51787678713 is a wasteful number, since it uses less digits than its factorization.

51787678713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17262559574.

The product of its digits is 13829760, while the sum is 60.

The spelling of 51787678713 in words is "fifty-one billion, seven hundred eighty-seven million, six hundred seventy-eight thousand, seven hundred thirteen".