51447391584 has 144 divisors (see below), whose sum is σ = 144204329808. Its totient is φ = 16056721408.

The previous prime is 51447391559. The next prime is 51447391613. The reversal of 51447391584 is 48519374415.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 23 ways as a sum of consecutive naturals, for example, 5460862 + ... + 5470274.

It is an arithmetic number, because the mean of its divisors is an integer number (1001418957).

Almost surely, 2^51447391584 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 51447391584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72102164904).

51447391584 is an abundant number, since it is smaller than the sum of its proper divisors (92756938224).

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

51447391584 is a wasteful number, since it uses less digits than its factorization.

51447391584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657 (or 9632 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 51.

The spelling of 51447391584 in words is "fifty-one billion, four hundred forty-seven million, three hundred ninety-one thousand, five hundred eighty-four".