51125204240 has 80 divisors (see below), whose sum is σ = 129785461056. Its totient is φ = 18574732800.

The previous prime is 51125204231. The next prime is 51125204281. The reversal of 51125204240 is 4240252115.

51125204240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51125204240² (a number of 22 digits) contains 22 as substring.

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, 1005674 + ... + 1055286.

Almost surely, 2^51125204240 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 51125204240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64892730528).

51125204240 is an abundant number, since it is smaller than the sum of its proper divisors (78660256816).

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

51125204240 is a wasteful number, since it uses less digits than its factorization.

51125204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50808 (or 50802 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 51125204240 its reverse (4240252115), we get a palindrome (55365456355).

The spelling of 51125204240 in words is "fifty-one billion, one hundred twenty-five million, two hundred four thousand, two hundred forty".