51725205505 has 4 divisors (see below), whose sum is σ = 62070246612. Its totient is φ = 41380164400.

The previous prime is 51725205473. The next prime is 51725205509. The reversal of 51725205505 is 50550252715.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18749551041 + 32975654464 = 136929^2 + 181592^2 .

It is not a de Polignac number, because 51725205505 - 2⁵ = 51725205473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51725205509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5172520546 + ... + 5172520555.

It is an arithmetic number, because the mean of its divisors is an integer number (15517561653).

It is a Proth number, since it is equal to 49329 ⋅ 2²⁰ + 1 and 49329 < 2²⁰.

Almost surely, 2^51725205505 is an apocalyptic number.

It is an amenable number.

51725205505 is a deficient number, since it is larger than the sum of its proper divisors (10345041107).

51725205505 is a wasteful number, since it uses less digits than its factorization.

51725205505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10345041106.

The product of its (nonzero) digits is 87500, while the sum is 37.

The spelling of 51725205505 in words is "fifty-one billion, seven hundred twenty-five million, two hundred five thousand, five hundred five".