51560442809 has 4 divisors (see below), whose sum is σ = 53802201216. Its totient is φ = 49318684404.

The previous prime is 51560442799. The next prime is 51560442811. The reversal of 51560442809 is 90824406515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51560442809 - 2²⁰ = 51559394233 is a prime.

It is a super-3 number, since 3×51560442809³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51560442809.

It is not an unprimeable number, because it can be changed into a prime (51560441809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1120879169 + ... + 1120879214.

It is an arithmetic number, because the mean of its divisors is an integer number (13450550304).

Almost surely, 2^51560442809 is an apocalyptic number.

It is an amenable number.

51560442809 is a deficient number, since it is larger than the sum of its proper divisors (2241758407).

51560442809 is a wasteful number, since it uses less digits than its factorization.

51560442809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241758406.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 51560442809 in words is "fifty-one billion, five hundred sixty million, four hundred forty-two thousand, eight hundred nine".