51145421052 has 96 divisors (see below), whose sum is σ = 134491392000. Its totient is φ = 14987116800.

The previous prime is 51145421027. The next prime is 51145421059. The reversal of 51145421052 is 25012454115.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145421059) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6334474 + ... + 6342542.

It is an arithmetic number, because the mean of its divisors is an integer number (1400952000).

Almost surely, 2^51145421052 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 51145421052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67245696000).

51145421052 is an abundant number, since it is smaller than the sum of its proper divisors (83345970948).

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

51145421052 is a wasteful number, since it uses less digits than its factorization.

51145421052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9667 (or 9665 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 51145421052 its reverse (25012454115), we get a palindrome (76157875167).

The spelling of 51145421052 in words is "fifty-one billion, one hundred forty-five million, four hundred twenty-one thousand, fifty-two".