51504412240 has 20 divisors (see below), whose sum is σ = 119747758644. Its totient is φ = 20601764864.

The previous prime is 51504412199. The next prime is 51504412259. The reversal of 51504412240 is 4221440515.

It can be written as a sum of positive squares in 2 ways, for example, as 29994083344 + 21510328896 = 173188^2 + 146664^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 51504412199 and 51504412208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321902497 + ... + 321902656.

Almost surely, 2^51504412240 is an apocalyptic number.

It is an amenable number.

51504412240 is an abundant number, since it is smaller than the sum of its proper divisors (68243346404).

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

51504412240 is a wasteful number, since it uses less digits than its factorization.

51504412240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643805166 (or 643805160 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 51504412240 its reverse (4221440515), we get a palindrome (55725852755).

The spelling of 51504412240 in words is "fifty-one billion, five hundred four million, four hundred twelve thousand, two hundred forty".