51105501011 has 4 divisors (see below), whose sum is σ = 51106007400. Its totient is φ = 51104994624.

The previous prime is 51105501001. The next prime is 51105501059. The reversal of 51105501011 is 11010550115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51105501011 - 2¹⁰ = 51105499987 is a prime.

It is a super-2 number, since 2×51105501011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51105501001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44441 + ... + 322778.

It is an arithmetic number, because the mean of its divisors is an integer number (12776501850).

Almost surely, 2^51105501011 is an apocalyptic number.

51105501011 is a deficient number, since it is larger than the sum of its proper divisors (506389).

51105501011 is a wasteful number, since it uses less digits than its factorization.

51105501011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506388.

The product of its (nonzero) digits is 125, while the sum is 20.

The spelling of 51105501011 in words is "fifty-one billion, one hundred five million, five hundred one thousand, eleven".