51055140040 has 32 divisors (see below), whose sum is σ = 116447689080. Its totient is φ = 20142300672.

The previous prime is 51055140011. The next prime is 51055140047. The reversal of 51055140040 is 4004155015.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45325558404 + 5729581636 = 212898^2 + 75694^2 .

It is a super-2 number, since 2×51055140040² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51055139987 and 51055140014.

It is not an unprimeable number, because it can be changed into a prime (51055140047) 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, 8739399 + ... + 8745238.

Almost surely, 2^51055140040 is an apocalyptic number.

It is an amenable number.

51055140040 is an abundant number, since it is smaller than the sum of its proper divisors (65392549040).

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

51055140040 is a wasteful number, since it uses less digits than its factorization.

51055140040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17484721 (or 17484717 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 51055140040 its reverse (4004155015), we get a palindrome (55059295055).

The spelling of 51055140040 in words is "fifty-one billion, fifty-five million, one hundred forty thousand, forty".