51385550164 has 24 divisors (see below), whose sum is σ = 96916562568. Its totient is φ = 23698147200.

The previous prime is 51385550149. The next prime is 51385550171. The reversal of 51385550164 is 46105558315.

It can be written as a sum of positive squares in 4 ways, for example, as 8146506564 + 43239043600 = 90258^2 + 207940^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51385550164.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312127 + ... + 447430.

It is an arithmetic number, because the mean of its divisors is an integer number (4038190107).

Almost surely, 2^51385550164 is an apocalyptic number.

It is an amenable number.

51385550164 is a deficient number, since it is larger than the sum of its proper divisors (45531012404).

51385550164 is a wasteful number, since it uses less digits than its factorization.

51385550164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760875 (or 760873 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 43.

The spelling of 51385550164 in words is "fifty-one billion, three hundred eighty-five million, five hundred fifty thousand, one hundred sixty-four".