51510440340 has 72 divisors (see below), whose sum is σ = 156642125640. Its totient is φ = 13701498624.

The previous prime is 51510440309. The next prime is 51510440341. The reversal of 51510440340 is 4304401515.

It is a happy number.

51510440340 is a `hidden beast` number, since 515 + 104 + 4 + 0 + 3 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9450172944 + 42060267396 = 97212^2 + 205086^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51510440341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288955 + ... + 431874.

Almost surely, 2^51510440340 is an apocalyptic number.

It is an amenable number.

51510440340 is an abundant number, since it is smaller than the sum of its proper divisors (105131685300).

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

51510440340 is a wasteful number, since it uses less digits than its factorization.

51510440340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721241 (or 721236 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 51510440340 its reverse (4304401515), we get a palindrome (55814841855).

The spelling of 51510440340 in words is "fifty-one billion, five hundred ten million, four hundred forty thousand, three hundred forty".