51433340520 has 128 divisors (see below), whose sum is σ = 159272023680. Its totient is φ = 13278720000.

The previous prime is 51433340513. The next prime is 51433340549. The reversal of 51433340520 is 2504333415.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 604620 + ... + 684420.

It is an arithmetic number, because the mean of its divisors is an integer number (1244312685).

Almost surely, 2^51433340520 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 51433340520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79636011840).

51433340520 is an abundant number, since it is smaller than the sum of its proper divisors (107838683160).

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

51433340520 is a wasteful number, since it uses less digits than its factorization.

51433340520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79987 (or 79983 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 51433340520 its reverse (2504333415), we get a palindrome (53937673935).

The spelling of 51433340520 in words is "fifty-one billion, four hundred thirty-three million, three hundred forty thousand, five hundred twenty".