51005120544 has 72 divisors (see below), whose sum is σ = 165766648320. Its totient is φ = 14572891008.

The previous prime is 51005120531. The next prime is 51005120563. The reversal of 51005120544 is 44502150015.

51005120544 is a `hidden beast` number, since 5 + 100 + 5 + 12 + 0 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12648064 + ... + 12652095.

It is an arithmetic number, because the mean of its divisors is an integer number (2302314560).

Almost surely, 2^51005120544 is an apocalyptic number.

It is an amenable number.

51005120544 is an abundant number, since it is smaller than the sum of its proper divisors (114761527776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51005120544 is a wasteful number, since it uses less digits than its factorization.

51005120544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25300182 (or 25300171 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 51005120544 its reverse (44502150015), we get a palindrome (95507270559).

The spelling of 51005120544 in words is "fifty-one billion, five million, one hundred twenty thousand, five hundred forty-four".