51438883416 has 128 divisors (see below), whose sum is σ = 137766942720. Its totient is φ = 15967125504.

The previous prime is 51438883411. The next prime is 51438883417. The reversal of 51438883416 is 61438883415.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438883411) 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, 5002056 + ... + 5012328.

It is an arithmetic number, because the mean of its divisors is an integer number (1076304240).

Almost surely, 2^51438883416 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 51438883416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68883471360).

51438883416 is an abundant number, since it is smaller than the sum of its proper divisors (86328059304).

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

51438883416 is a wasteful number, since it uses less digits than its factorization.

51438883416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10545 (or 10541 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 51.

Subtracting 51438883416 from its reverse (61438883415), we obtain a palindrome (9999999999).

The spelling of 51438883416 in words is "fifty-one billion, four hundred thirty-eight million, eight hundred eighty-three thousand, four hundred sixteen".