51719921711 has 4 divisors (see below), whose sum is σ = 52922710632. Its totient is φ = 50517132792.

The previous prime is 51719921707. The next prime is 51719921713. The reversal of 51719921711 is 11712991715.

51719921711 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.

It is a cyclic number.

It is not a de Polignac number, because 51719921711 - 2² = 51719921707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51719921713) 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, 601394396 + ... + 601394481.

It is an arithmetic number, because the mean of its divisors is an integer number (13230677658).

Almost surely, 2^51719921711 is an apocalyptic number.

51719921711 is a deficient number, since it is larger than the sum of its proper divisors (1202788921).

51719921711 is a wasteful number, since it uses less digits than its factorization.

51719921711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202788920.

The product of its digits is 39690, while the sum is 44.

The spelling of 51719921711 in words is "fifty-one billion, seven hundred nineteen million, nine hundred twenty-one thousand, seven hundred eleven".