51243523572 has 96 divisors (see below), whose sum is σ = 127524741120. Its totient is φ = 15959508480.

The previous prime is 51243523571. The next prime is 51243523579. The reversal of 51243523572 is 27532534215.

It is a self number, because there is not a number n which added to its sum of digits gives 51243523572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51243523571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39692247 + ... + 39693537.

It is an arithmetic number, because the mean of its divisors is an integer number (1328382720).

Almost surely, 2^51243523572 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 51243523572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63762370560).

51243523572 is an abundant number, since it is smaller than the sum of its proper divisors (76281217548).

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

51243523572 is a wasteful number, since it uses less digits than its factorization.

51243523572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581 (or 2579 counting only the distinct ones).

The product of its digits is 252000, while the sum is 39.

The spelling of 51243523572 in words is "fifty-one billion, two hundred forty-three million, five hundred twenty-three thousand, five hundred seventy-two".