51505550015511 has 16 divisors (see below), whose sum is σ = 72390449686400. Its totient is φ = 32483939766048.

The previous prime is 51505550015497. The next prime is 51505550015597. The reversal of 51505550015511 is 11551005550515.

It is not a de Polignac number, because 51505550015511 - 2⁹ = 51505550014999 is a prime.

It is a super-2 number, since 2×51505550015511² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51505550015511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505550015611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637199461 + ... + 637280286.

It is an arithmetic number, because the mean of its divisors is an integer number (4524403105400).

Almost surely, 2^{51505550015511} is an apocalyptic number.

51505550015511 is a deficient number, since it is larger than the sum of its proper divisors (20884899670889).

51505550015511 is a wasteful number, since it uses less digits than its factorization.

51505550015511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274480478.

The product of its (nonzero) digits is 78125, while the sum is 39.

The spelling of 51505550015511 in words is "fifty-one trillion, five hundred five billion, five hundred fifty million, fifteen thousand, five hundred eleven".