51225132240 has 100 divisors (see below), whose sum is σ = 177912495684. Its totient is φ = 13660033536.

The previous prime is 51225132223. The next prime is 51225132247. The reversal of 51225132240 is 4223152215.

51225132240 is a `hidden beast` number, since 5 + 122 + 513 + 2 + 24 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27161676864 + 24063455376 = 164808^2 + 155124^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51225132247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3946077 + ... + 3959036.

Almost surely, 2^51225132240 is an apocalyptic number.

It is an amenable number.

51225132240 is an abundant number, since it is smaller than the sum of its proper divisors (126687363444).

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

51225132240 is a wasteful number, since it uses less digits than its factorization.

51225132240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905138 (or 7905123 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 51225132240 its reverse (4223152215), we get a palindrome (55448284455).

The spelling of 51225132240 in words is "fifty-one billion, two hundred twenty-five million, one hundred thirty-two thousand, two hundred forty".