51051111055581 has 32 divisors (see below), whose sum is σ = 86478639751168. Its totient is φ = 26059411523520.

The previous prime is 51051111055489. The next prime is 51051111055591. The reversal of 51051111055581 is 18555011115015.

51051111055581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51051111055581 - 2¹⁴ = 51051111039197 is a prime.

It is a super-2 number, since 2×51051111055581² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051111055591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3016127131 + ... + 3016144056.

It is an arithmetic number, because the mean of its divisors is an integer number (2702457492224).

Almost surely, 2^{51051111055581} is an apocalyptic number.

It is an amenable number.

51051111055581 is a deficient number, since it is larger than the sum of its proper divisors (35427528695587).

51051111055581 is a wasteful number, since it uses less digits than its factorization.

51051111055581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6032271241.

The product of its (nonzero) digits is 25000, while the sum is 39.

The spelling of 51051111055581 in words is "fifty-one trillion, fifty-one billion, one hundred eleven million, fifty-five thousand, five hundred eighty-one".