51105665012265 has 24 divisors (see below), whose sum is σ = 88695710757888. Its totient is φ = 27221721420960.

The previous prime is 51105665012261. The next prime is 51105665012273. The reversal of 51105665012265 is 56221056650115.

It is a happy number.

51105665012265 is a `hidden beast` number, since 5 + 1 + 1 + 0 + 5 + 66 + 501 + 22 + 65 = 666.

51105665012265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51105665012265 - 2² = 51105665012261 is a prime.

It is a super-2 number, since 2×51105665012265² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51105665012265.

It is not an unprimeable number, because it can be changed into a prime (51105665012261) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 721490281 + ... + 721561110.

It is an arithmetic number, because the mean of its divisors is an integer number (3695654614912).

Almost surely, 2^{51105665012265} is an apocalyptic number.

It is an amenable number.

51105665012265 is a deficient number, since it is larger than the sum of its proper divisors (37590045745623).

51105665012265 is a wasteful number, since it uses less digits than its factorization.

51105665012265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443052189 (or 1443052186 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 51105665012265 in words is "fifty-one trillion, one hundred five billion, six hundred sixty-five million, twelve thousand, two hundred sixty-five".