51545431140 has 192 divisors, whose sum is σ = 171356774400. Its totient is φ = 11327307264.

The previous prime is 51545431129. The next prime is 51545431163. The reversal of 51545431140 is 4113454515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2902167 + ... + 2919873.

It is an arithmetic number, because the mean of its divisors is an integer number (892483200).

Almost surely, 2^51545431140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51545431140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85678387200).

51545431140 is an abundant number, since it is smaller than the sum of its proper divisors (119811343260).

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

51545431140 is a wasteful number, since it uses less digits than its factorization.

51545431140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17994 (or 17992 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 51545431140 its reverse (4113454515), we get a palindrome (55658885655).

The spelling of 51545431140 in words is "fifty-one billion, five hundred forty-five million, four hundred thirty-one thousand, one hundred forty".