51643447584 has 96 divisors (see below), whose sum is σ = 141510136320. Its totient is φ = 16471910400.

The previous prime is 51643447549. The next prime is 51643447607. The reversal of 51643447584 is 48574434615.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×51643447584² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167374 + ... + 362354.

It is an arithmetic number, because the mean of its divisors is an integer number (1474063920).

Almost surely, 2^51643447584 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 51643447584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70755068160).

51643447584 is an abundant number, since it is smaller than the sum of its proper divisors (89866688736).

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

51643447584 is a wasteful number, since it uses less digits than its factorization.

51643447584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195114 (or 195106 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 51.

The spelling of 51643447584 in words is "fifty-one billion, six hundred forty-three million, four hundred forty-seven thousand, five hundred eighty-four".