51240043040 has 24 divisors (see below), whose sum is σ = 121054602060. Its totient is φ = 20496017152.

The previous prime is 51240043021. The next prime is 51240043051. The reversal of 51240043040 is 4034004215.

It can be written as a sum of positive squares in 2 ways, for example, as 51113975056 + 126067984 = 226084^2 + 11228^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51240042997 and 51240043015.

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, 160124975 + ... + 160125294.

Almost surely, 2^51240043040 is an apocalyptic number.

It is an amenable number.

51240043040 is an abundant number, since it is smaller than the sum of its proper divisors (69814559020).

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

51240043040 is a wasteful number, since it uses less digits than its factorization.

51240043040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320250284 (or 320250276 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 51240043040 its reverse (4034004215), we get a palindrome (55274047255).

The spelling of 51240043040 in words is "fifty-one billion, two hundred forty million, forty-three thousand, forty".