51531105525440 has 56 divisors (see below), whose sum is σ = 122709558431040. Its totient is φ = 20612255182848.

The previous prime is 51531105525421. The next prime is 51531105525443. The reversal of 51531105525440 is 4452550113515.

It is not an unprimeable number, because it can be changed into a prime (51531105525443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37754744 + ... + 39095816.

It is an arithmetic number, because the mean of its divisors is an integer number (2191242114840).

Almost surely, 2^{51531105525440} is an apocalyptic number.

It is an amenable number.

51531105525440 is an abundant number, since it is smaller than the sum of its proper divisors (71178452905600).

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

51531105525440 is a wasteful number, since it uses less digits than its factorization.

51531105525440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461169 (or 1461159 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 41.

Adding to 51531105525440 its reverse (4452550113515), we get a palindrome (55983655638955).

The spelling of 51531105525440 in words is "fifty-one trillion, five hundred thirty-one billion, one hundred five million, five hundred twenty-five thousand, four hundred forty".