51110220565 has 8 divisors (see below), whose sum is σ = 61354887768. Its totient is φ = 40873094400.

The previous prime is 51110220559. The next prime is 51110220587. The reversal of 51110220565 is 56502201115.

It can be written as a sum of positive squares in 4 ways, for example, as 9576188164 + 41534032401 = 97858^2 + 203799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51110220565 - 2²⁷ = 50976002837 is a prime.

It is a super-2 number, since 2×51110220565² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 1870336 + ... + 1897465.

It is an arithmetic number, because the mean of its divisors is an integer number (7669360971).

Almost surely, 2^51110220565 is an apocalyptic number.

It is an amenable number.

51110220565 is a deficient number, since it is larger than the sum of its proper divisors (10244667203).

51110220565 is a wasteful number, since it uses less digits than its factorization.

51110220565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3770519.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 51110220565 in words is "fifty-one billion, one hundred ten million, two hundred twenty thousand, five hundred sixty-five".