51511850440 has 32 divisors (see below), whose sum is σ = 115952067000. Its totient is φ = 20595779584.

The previous prime is 51511850417. The next prime is 51511850483. The reversal of 51511850440 is 4405811515.

It can be written as a sum of positive squares in 4 ways, for example, as 51419190564 + 92659876 = 226758^2 + 9626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51511850396 and 51511850405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186505 + ... + 371224.

Almost surely, 2^51511850440 is an apocalyptic number.

It is an amenable number.

51511850440 is an abundant number, since it is smaller than the sum of its proper divisors (64440216560).

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

51511850440 is a wasteful number, since it uses less digits than its factorization.

51511850440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560049 (or 560045 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 34.

The spelling of 51511850440 in words is "fifty-one billion, five hundred eleven million, eight hundred fifty thousand, four hundred forty".