51332431440 has 80 divisors (see below), whose sum is σ = 160019668800. Its totient is φ = 13612164096.

The previous prime is 51332431433. The next prime is 51332431441. The reversal of 51332431440 is 4413423315.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51332431398 and 51332431407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51332431441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 554485 + ... + 640404.

It is an arithmetic number, because the mean of its divisors is an integer number (2000245860).

Almost surely, 2^51332431440 is an apocalyptic number.

It is an amenable number.

51332431440 is an abundant number, since it is smaller than the sum of its proper divisors (108687237360).

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

51332431440 is a wasteful number, since it uses less digits than its factorization.

51332431440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195084 (or 1195078 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 51332431440 its reverse (4413423315), we get a palindrome (55745854755).

The spelling of 51332431440 in words is "fifty-one billion, three hundred thirty-two million, four hundred thirty-one thousand, four hundred forty".