51231471229440 has 480 divisors, whose sum is σ = 180223890200640. Its totient is φ = 13446856507392.

The previous prime is 51231471229417. The next prime is 51231471229451. The reversal of 51231471229440 is 4492217413215.

51231471229440 is a `hidden beast` number, since 5 + 1 + 2 + 31 + 471 + 22 + 94 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1989790647 + ... + 1989816393.

It is an arithmetic number, because the mean of its divisors is an integer number (375466437918).

Almost surely, 2^{51231471229440} 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 51231471229440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90111945100320).

51231471229440 is an abundant number, since it is smaller than the sum of its proper divisors (128992418971200).

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

51231471229440 is a wasteful number, since it uses less digits than its factorization.

51231471229440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27132 (or 27113 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 51231471229440 in words is "fifty-one trillion, two hundred thirty-one billion, four hundred seventy-one million, two hundred twenty-nine thousand, four hundred forty".