51355161365 has 16 divisors (see below), whose sum is σ = 65984433840. Its totient is φ = 38232944640.

The previous prime is 51355161349. The next prime is 51355161371. The reversal of 51355161365 is 56316155315.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2059616689 + 49295544676 = 45383^2 + 222026^2 .

It is not a de Polignac number, because 51355161365 - 2⁴ = 51355161349 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3386696 + ... + 3401825.

It is an arithmetic number, because the mean of its divisors is an integer number (4124027115).

Almost surely, 2^51355161365 is an apocalyptic number.

It is an amenable number.

51355161365 is a deficient number, since it is larger than the sum of its proper divisors (14629272475).

51355161365 is a wasteful number, since it uses less digits than its factorization.

51355161365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6788632.

The product of its digits is 202500, while the sum is 41.

The spelling of 51355161365 in words is "fifty-one billion, three hundred fifty-five million, one hundred sixty-one thousand, three hundred sixty-five".