51381261140 has 48 divisors (see below), whose sum is σ = 117725408640. Its totient is φ = 18681617280.

The previous prime is 51381261133. The next prime is 51381261161. The reversal of 51381261140 is 4116218315.

It is a junction number, because it is equal to n+sod(n) for n = 51381261097 and 51381261106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2847266 + ... + 2865254.

It is an arithmetic number, because the mean of its divisors is an integer number (2452612680).

Almost surely, 2^51381261140 is an apocalyptic number.

It is an amenable number.

51381261140 is an abundant number, since it is smaller than the sum of its proper divisors (66344147500).

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

51381261140 is a wasteful number, since it uses less digits than its factorization.

51381261140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30992 (or 30990 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

Adding to 51381261140 its reverse (4116218315), we get a palindrome (55497479455).

The spelling of 51381261140 in words is "fifty-one billion, three hundred eighty-one million, two hundred sixty-one thousand, one hundred forty".