51636636450 has 576 divisors, whose sum is σ = 173460897792. Its totient is φ = 10754726400.

The previous prime is 51636636449. The next prime is 51636636461. The reversal of 51636636450 is 5463663615.

51636636450 is a `hidden beast` number, since 5 + 1 + 6 + 3 + 6 + 636 + 4 + 5 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 51636636396 and 51636636405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 186413712 + ... + 186413988.

It is an arithmetic number, because the mean of its divisors is an integer number (301147392).

Almost surely, 2^51636636450 is an apocalyptic number.

51636636450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51636636450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86730448896).

51636636450 is an abundant number, since it is smaller than the sum of its proper divisors (121824261342).

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

51636636450 is a wasteful number, since it uses less digits than its factorization.

51636636450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 51636636450 in words is "fifty-one billion, six hundred thirty-six million, six hundred thirty-six thousand, four hundred fifty".