51644745126 has 160 divisors (see below), whose sum is σ = 128425717728. Its totient is φ = 15413276160.

The previous prime is 51644745121. The next prime is 51644745127. The reversal of 51644745126 is 62154744615.

51644745126 is a `hidden beast` number, since 5 + 1 + 64 + 4 + 74 + 512 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51644745121) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 9375265 + ... + 9380771.

Almost surely, 2^51644745126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51644745126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64212858864).

51644745126 is an abundant number, since it is smaller than the sum of its proper divisors (76780972602).

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

51644745126 is a wasteful number, since it uses less digits than its factorization.

51644745126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668 (or 5659 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 51644745126 in words is "fifty-one billion, six hundred forty-four million, seven hundred forty-five thousand, one hundred twenty-six".