51555134240 has 48 divisors (see below), whose sum is σ = 121857825600. Its totient is φ = 20612094720.

The previous prime is 51555134143. The next prime is 51555134251. The reversal of 51555134240 is 4243155515.

It is a self number, because there is not a number n which added to its sum of digits gives 51555134240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259085 + ... + 412595.

It is an arithmetic number, because the mean of its divisors is an integer number (2538704700).

Almost surely, 2^51555134240 is an apocalyptic number.

It is an amenable number.

51555134240 is an abundant number, since it is smaller than the sum of its proper divisors (70302691360).

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

51555134240 is a wasteful number, since it uses less digits than its factorization.

51555134240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155625 (or 155617 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 51555134240 its reverse (4243155515), we get a palindrome (55798289755).

The spelling of 51555134240 in words is "fifty-one billion, five hundred fifty-five million, one hundred thirty-four thousand, two hundred forty".