51440005563 has 16 divisors (see below), whose sum is σ = 71573945856. Its totient is φ = 32799919680.

The previous prime is 51440005553. The next prime is 51440005567. The reversal of 51440005563 is 36550004415.

It is not a de Polignac number, because 51440005563 - 2²⁴ = 51423228347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51440005567) 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 15 ways as a sum of consecutive naturals, for example, 1868031 + ... + 1895367.

It is an arithmetic number, because the mean of its divisors is an integer number (4473371616).

Almost surely, 2^51440005563 is an apocalyptic number.

51440005563 is a deficient number, since it is larger than the sum of its proper divisors (20133940293).

51440005563 is a wasteful number, since it uses less digits than its factorization.

51440005563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54634.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 51440005563 its reverse (36550004415), we get a palindrome (87990009978).

The spelling of 51440005563 in words is "fifty-one billion, four hundred forty million, five thousand, five hundred sixty-three".