51719576681 has 4 divisors (see below), whose sum is σ = 53968253952. Its totient is φ = 49470899412.

The previous prime is 51719576653. The next prime is 51719576683. The reversal of 51719576681 is 18667591715.

It is a happy number.

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 51719576681 - 2⁶ = 51719576617 is a prime.

It is a super-2 number, since 2×51719576681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51719576683) 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, 1124338601 + ... + 1124338646.

It is an arithmetic number, because the mean of its divisors is an integer number (13492063488).

Almost surely, 2^51719576681 is an apocalyptic number.

It is an amenable number.

51719576681 is a deficient number, since it is larger than the sum of its proper divisors (2248677271).

51719576681 is a wasteful number, since it uses less digits than its factorization.

51719576681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248677270.

The product of its digits is 3175200, while the sum is 56.

The spelling of 51719576681 in words is "fifty-one billion, seven hundred nineteen million, five hundred seventy-six thousand, six hundred eighty-one".