51810812416 has 240 divisors, whose sum is σ = 126283212000. Its totient is φ = 20984463360.

The previous prime is 51810812407. The next prime is 51810812429. The reversal of 51810812416 is 61421801815.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34562835 + ... + 34564333.

It is an arithmetic number, because the mean of its divisors is an integer number (526180050).

Almost surely, 2^51810812416 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 51810812416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63141606000).

51810812416 is an abundant number, since it is smaller than the sum of its proper divisors (74472399584).

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

51810812416 is a wasteful number, since it uses less digits than its factorization.

51810812416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 37.

The spelling of 51810812416 in words is "fifty-one billion, eight hundred ten million, eight hundred twelve thousand, four hundred sixteen".