51143820544 has 144 divisors (see below), whose sum is σ = 110420150400. Its totient is φ = 23553441792.

The previous prime is 51143820523. The next prime is 51143820587. The reversal of 51143820544 is 44502834115.

It is a congruent number.

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, 105017869 + ... + 105018355.

It is an arithmetic number, because the mean of its divisors is an integer number (766806600).

Almost surely, 2^51143820544 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 51143820544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55210075200).

51143820544 is an abundant number, since it is smaller than the sum of its proper divisors (59276329856).

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

51143820544 is a wasteful number, since it uses less digits than its factorization.

51143820544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 51143820544 in words is "fifty-one billion, one hundred forty-three million, eight hundred twenty thousand, five hundred forty-four".