51561744343 has 4 divisors (see below), whose sum is σ = 51753423960. Its totient is φ = 51370064728.

The previous prime is 51561744341. The next prime is 51561744359. The reversal of 51561744343 is 34344716515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51561744343 - 2¹ = 51561744341 is a prime.

It is a super-2 number, since 2×51561744343² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51561744343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561744341) 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, 95839405 + ... + 95839942.

It is an arithmetic number, because the mean of its divisors is an integer number (12938355990).

Almost surely, 2^51561744343 is an apocalyptic number.

51561744343 is a deficient number, since it is larger than the sum of its proper divisors (191679617).

51561744343 is a wasteful number, since it uses less digits than its factorization.

51561744343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191679616.

The product of its digits is 604800, while the sum is 43.

The spelling of 51561744343 in words is "fifty-one billion, five hundred sixty-one million, seven hundred forty-four thousand, three hundred forty-three".