51512512145 has 4 divisors (see below), whose sum is σ = 61815014580. Its totient is φ = 41210009712.

The previous prime is 51512512127. The next prime is 51512512151. The reversal of 51512512145 is 54121521515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54121521515 = 5 ⋅10824304303.

It can be written as a sum of positive squares in 2 ways, for example, as 31963718656 + 19548793489 = 178784^2 + 139817^2 .

It is a cyclic number.

It is not a de Polignac number, because 51512512145 - 2²² = 51508317841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5151251210 + ... + 5151251219.

It is an arithmetic number, because the mean of its divisors is an integer number (15453753645).

Almost surely, 2^51512512145 is an apocalyptic number.

It is an amenable number.

51512512145 is a deficient number, since it is larger than the sum of its proper divisors (10302502435).

51512512145 is a wasteful number, since it uses less digits than its factorization.

51512512145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10302502434.

The product of its digits is 10000, while the sum is 32.

The spelling of 51512512145 in words is "fifty-one billion, five hundred twelve million, five hundred twelve thousand, one hundred forty-five".