51721725425 has 24 divisors (see below), whose sum is σ = 67649390400. Its totient is φ = 39118956480.

The previous prime is 51721725397. The next prime is 51721725457. The reversal of 51721725425 is 52452712715.

It is a happy number.

It is not a de Polignac number, because 51721725425 - 2¹⁰ = 51721724401 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 119531 + ... + 343119.

It is an arithmetic number, because the mean of its divisors is an integer number (2818724600).

Almost surely, 2^51721725425 is an apocalyptic number.

It is an amenable number.

51721725425 is a deficient number, since it is larger than the sum of its proper divisors (15927664975).

51721725425 is a wasteful number, since it uses less digits than its factorization.

51721725425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224105 (or 224100 counting only the distinct ones).

The product of its digits is 196000, while the sum is 41.

The spelling of 51721725425 in words is "fifty-one billion, seven hundred twenty-one million, seven hundred twenty-five thousand, four hundred twenty-five".