51365100012565 has 8 divisors (see below), whose sum is σ = 61654792506840. Its totient is φ = 41080965015552.

The previous prime is 51365100012547. The next prime is 51365100012623. The reversal of 51365100012565 is 56521000156315.

It is a happy number.

51365100012565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 549060252196 + 50816039760369 = 740986^2 + 7128537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51365100012565 - 2¹⁵ = 51365099979797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1389353980 + ... + 1389390949.

It is an arithmetic number, because the mean of its divisors is an integer number (7706849063355).

Almost surely, 2^{51365100012565} is an apocalyptic number.

It is an amenable number.

51365100012565 is a deficient number, since it is larger than the sum of its proper divisors (10289692494275).

51365100012565 is a wasteful number, since it uses less digits than its factorization.

51365100012565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778748631.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51365100012565 in words is "fifty-one trillion, three hundred sixty-five billion, one hundred million, twelve thousand, five hundred sixty-five".