51132440000 has 140 divisors (see below), whose sum is σ = 127268029944. Its totient is φ = 20376192000.

The previous prime is 51132439991. The next prime is 51132440017. The reversal of 51132440000 is 4423115.

It is a super-2 number, since 2×51132440000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 11317742 + ... + 11322258.

Almost surely, 2^51132440000 is an apocalyptic number.

51132440000 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 51132440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63634014972).

51132440000 is an abundant number, since it is smaller than the sum of its proper divisors (76135589944).

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

51132440000 is an equidigital number, since it uses as much as digits as its factorization.

51132440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832 (or 4807 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 51132440000 its reverse (4423115), we get a palindrome (51136863115).

The spelling of 51132440000 in words is "fifty-one billion, one hundred thirty-two million, four hundred forty thousand".