51535321440 has 96 divisors (see below), whose sum is σ = 163015856640. Its totient is φ = 13685220864.

The previous prime is 51535321433. The next prime is 51535321457. The reversal of 51535321440 is 4412353515.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109894 + ... + 339333.

It is an arithmetic number, because the mean of its divisors is an integer number (1698081840).

Almost surely, 2^51535321440 is an apocalyptic number.

It is an amenable number.

51535321440 is an abundant number, since it is smaller than the sum of its proper divisors (111480535200).

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

51535321440 is a wasteful number, since it uses less digits than its factorization.

51535321440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449484 (or 449476 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 51535321440 its reverse (4412353515), we get a palindrome (55947674955).

The spelling of 51535321440 in words is "fifty-one billion, five hundred thirty-five million, three hundred twenty-one thousand, four hundred forty".