51243413440 has 112 divisors (see below), whose sum is σ = 131917744800. Its totient is φ = 18893647872.

The previous prime is 51243413393. The next prime is 51243413443. The reversal of 51243413440 is 4431434215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51243413443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111066 + ... + 338854.

Almost surely, 2^51243413440 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 51243413440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65958872400).

51243413440 is an abundant number, since it is smaller than the sum of its proper divisors (80674331360).

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

51243413440 is a wasteful number, since it uses less digits than its factorization.

51243413440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227862 (or 227852 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 51243413440 its reverse (4431434215), we get a palindrome (55674847655).

The spelling of 51243413440 in words is "fifty-one billion, two hundred forty-three million, four hundred thirteen thousand, four hundred forty".