51565304981185 has 4 divisors (see below), whose sum is σ = 61878365977428. Its totient is φ = 41252243984944.

The previous prime is 51565304981173. The next prime is 51565304981189. The reversal of 51565304981185 is 58118940356515.

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 7151730729984 + 44413574251201 = 2674272^2 + 6664351^2 .

It is a cyclic number.

It is not a de Polignac number, because 51565304981185 - 2¹¹ = 51565304979137 is a prime.

It is a super-3 number, since 3×51565304981185³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51565304981189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5156530498114 + ... + 5156530498123.

It is an arithmetic number, because the mean of its divisors is an integer number (15469591494357).

Almost surely, 2^{51565304981185} is an apocalyptic number.

It is an amenable number.

51565304981185 is a deficient number, since it is larger than the sum of its proper divisors (10313060996243).

51565304981185 is a wasteful number, since it uses less digits than its factorization.

51565304981185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10313060996242.

The product of its (nonzero) digits is 25920000, while the sum is 61.

The spelling of 51565304981185 in words is "fifty-one trillion, five hundred sixty-five billion, three hundred four million, nine hundred eighty-one thousand, one hundred eighty-five".