51320240000 has 160 divisors (see below), whose sum is σ = 130486356000. Its totient is φ = 20089856000.

The previous prime is 51320239973. The next prime is 51320240017. The reversal of 51320240000 is 4202315.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3753176 + ... + 3766824.

It is an arithmetic number, because the mean of its divisors is an integer number (815539725).

Almost surely, 2^51320240000 is an apocalyptic number.

51320240000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51320240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65243178000).

51320240000 is an abundant number, since it is smaller than the sum of its proper divisors (79166116000).

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

51320240000 is an equidigital number, since it uses as much as digits as its factorization.

51320240000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13730 (or 13703 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

Adding to 51320240000 its reverse (4202315), we get a palindrome (51324442315).

The spelling of 51320240000 in words is "fifty-one billion, three hundred twenty million, two hundred forty thousand".