51636838212 has 108 divisors (see below), whose sum is σ = 135639349300. Its totient is φ = 16562617344.

The previous prime is 51636838193. The next prime is 51636838237. The reversal of 51636838212 is 21283863615.

51636838212 is a `hidden beast` number, since 5 + 1 + 636 + 8 + 3 + 8 + 2 + 1 + 2 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 14451886656 + 37184951556 = 120216^2 + 192834^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9473664 + ... + 9479112.

Almost surely, 2^51636838212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51636838212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67819674650).

51636838212 is an abundant number, since it is smaller than the sum of its proper divisors (84002511088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51636838212 is a wasteful number, since it uses less digits than its factorization.

51636838212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830 (or 5796 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 51636838212 in words is "fifty-one billion, six hundred thirty-six million, eight hundred thirty-eight thousand, two hundred twelve".