51711387069969 has 135 divisors (see below), whose sum is σ = 89636357136249. Its totient is φ = 29682982208880.

The previous prime is 51711387069913. The next prime is 51711387069997. The reversal of 51711387069969 is 96996078311715.

The square root of 51711387069969 is 7191063.

It is a perfect power (a square), and thus also a powerful number.

51711387069969 is a `hidden beast` number, since 517 + 1 + 1 + 38 + 70 + 6 + 9 + 9 + 6 + 9 = 666.

It is not a de Polignac number, because 51711387069969 - 2²¹ = 51711384972817 is a prime.

It is a super-2 number, since 2×51711387069969² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51711387069897 and 51711387069906.

It is not an unprimeable number, because it can be changed into a prime (51711387062969) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 13526387592 + ... + 13526391414.

Almost surely, 2^{51711387069969} is an apocalyptic number.

51711387069969 is the 7191063-rd square number.

51711387069969 is the 3595532-nd centered octagonal number.

It is an amenable number.

51711387069969 is a deficient number, since it is larger than the sum of its proper divisors (37924970066280).

51711387069969 is an frugal number, since it uses more digits than its factorization.

51711387069969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7718 (or 3856 counting only the distinct ones).

The product of its (nonzero) digits is 154314720, while the sum is 72.

The spelling of 51711387069969 in words is "fifty-one trillion, seven hundred eleven billion, three hundred eighty-seven million, sixty-nine thousand, nine hundred sixty-nine".