51015564125 has 8 divisors (see below), whose sum is σ = 63667424184. Its totient is φ = 40812451200.

The previous prime is 51015564121. The next prime is 51015564151. The reversal of 51015564125 is 52146551015.

It can be written as a sum of positive squares in 4 ways, for example, as 10994361316 + 40021202809 = 104854^2 + 200053^2 .

It is not a de Polignac number, because 51015564125 - 2² = 51015564121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51015564121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204062132 + ... + 204062381.

It is an arithmetic number, because the mean of its divisors is an integer number (7958428023).

Almost surely, 2^51015564125 is an apocalyptic number.

It is an amenable number.

51015564125 is a deficient number, since it is larger than the sum of its proper divisors (12651860059).

51015564125 is an equidigital number, since it uses as much as digits as its factorization.

51015564125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408124528 (or 408124518 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 35.

The spelling of 51015564125 in words is "fifty-one billion, fifteen million, five hundred sixty-four thousand, one hundred twenty-five".