51555244624 has 80 divisors (see below), whose sum is σ = 111606606720. Its totient is φ = 22907082240.

The previous prime is 51555244591. The next prime is 51555244627. The reversal of 51555244624 is 42644255515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51555244627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080789 + ... + 2105419.

It is an arithmetic number, because the mean of its divisors is an integer number (1395082584).

Almost surely, 2^51555244624 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 51555244624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55803303360).

51555244624 is an abundant number, since it is smaller than the sum of its proper divisors (60051362096).

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

51555244624 is a wasteful number, since it uses less digits than its factorization.

51555244624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25028 (or 25022 counting only the distinct ones).

The product of its digits is 960000, while the sum is 43.

The spelling of 51555244624 in words is "fifty-one billion, five hundred fifty-five million, two hundred forty-four thousand, six hundred twenty-four".