51455535165 has 24 divisors (see below), whose sum is σ = 89227207680. Its totient is φ = 27431378784.

The previous prime is 51455535133. The next prime is 51455535169. The reversal of 51455535165 is 56153555415.

51455535165 is a `hidden beast` number, since 5 + 1 + 4 + 55 + 535 + 1 + 65 = 666.

It is not a de Polignac number, because 51455535165 - 2⁵ = 51455535133 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51455535165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51455535169) 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, 132685 + ... + 347154.

It is an arithmetic number, because the mean of its divisors is an integer number (3717800320).

Almost surely, 2^51455535165 is an apocalyptic number.

It is an amenable number.

51455535165 is a deficient number, since it is larger than the sum of its proper divisors (37771672515).

51455535165 is a wasteful number, since it uses less digits than its factorization.

51455535165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482233 (or 482230 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The spelling of 51455535165 in words is "fifty-one billion, four hundred fifty-five million, five hundred thirty-five thousand, one hundred sixty-five".