51345305540 has 12 divisors (see below), whose sum is σ = 107825141676. Its totient is φ = 20538122208.

The previous prime is 51345305527. The next prime is 51345305563. The reversal of 51345305540 is 4550354315.

It can be written as a sum of positive squares in 2 ways, for example, as 39527006596 + 11818298944 = 198814^2 + 108712^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51345305540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283632619 + ... + 1283632658.

It is an arithmetic number, because the mean of its divisors is an integer number (8985428473).

Almost surely, 2^51345305540 is an apocalyptic number.

It is an amenable number.

51345305540 is an abundant number, since it is smaller than the sum of its proper divisors (56479836136).

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

51345305540 is a wasteful number, since it uses less digits than its factorization.

51345305540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567265286 (or 2567265284 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 51345305540 its reverse (4550354315), we get a palindrome (55895659855).

The spelling of 51345305540 in words is "fifty-one billion, three hundred forty-five million, three hundred five thousand, five hundred forty".