51325413520 has 20 divisors (see below), whose sum is σ = 119331586620. Its totient is φ = 20530165376.

The previous prime is 51325413497. The next prime is 51325413533. The reversal of 51325413520 is 2531452315.

It can be written as a sum of positive squares in 2 ways, for example, as 21664307344 + 29661106176 = 147188^2 + 172224^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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, 320783755 + ... + 320783914.

It is an arithmetic number, because the mean of its divisors is an integer number (5966579331).

Almost surely, 2^51325413520 is an apocalyptic number.

It is an amenable number.

51325413520 is an abundant number, since it is smaller than the sum of its proper divisors (68006173100).

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

51325413520 is a wasteful number, since it uses less digits than its factorization.

51325413520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641567682 (or 641567676 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 51325413520 its reverse (2531452315), we get a palindrome (53856865835).

The spelling of 51325413520 in words is "fifty-one billion, three hundred twenty-five million, four hundred thirteen thousand, five hundred twenty".