51520815711 has 12 divisors (see below), whose sum is σ = 74442841200. Its totient is φ = 34336186560.

The previous prime is 51520815691. The next prime is 51520815721. The reversal of 51520815711 is 11751802515.

51520815711 is a `hidden beast` number, since 5 + 1 + 5 + 2 + 0 + 81 + 571 + 1 = 666.

It is not a de Polignac number, because 51520815711 - 2¹³ = 51520807519 is a prime.

It is a super-3 number, since 3×51520815711³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520815721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 889011 + ... + 945188.

It is an arithmetic number, because the mean of its divisors is an integer number (6203570100).

Almost surely, 2^51520815711 is an apocalyptic number.

51520815711 is a deficient number, since it is larger than the sum of its proper divisors (22922025489).

51520815711 is a wasteful number, since it uses less digits than its factorization.

51520815711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837326 (or 1837323 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 36.

The spelling of 51520815711 in words is "fifty-one billion, five hundred twenty million, eight hundred fifteen thousand, seven hundred eleven".