51440412555 has 128 divisors (see below), whose sum is σ = 105906493440. Its totient is φ = 23204413440.

The previous prime is 51440412553. The next prime is 51440412559. The reversal of 51440412555 is 55521404415.

51440412555 is a `hidden beast` number, since 51 + 4 + 40 + 4 + 12 + 555 = 666.

It is not a de Polignac number, because 51440412555 - 2¹ = 51440412553 is a prime.

It is a super-2 number, since 2×51440412555² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51440412553) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23891359 + ... + 23893511.

It is an arithmetic number, because the mean of its divisors is an integer number (827394480).

Almost surely, 2^51440412555 is an apocalyptic number.

51440412555 is an abundant number, since it is smaller than the sum of its proper divisors (54466080885).

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

51440412555 is a wasteful number, since it uses less digits than its factorization.

51440412555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498 (or 2492 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 36.

The spelling of 51440412555 in words is "fifty-one billion, four hundred forty million, four hundred twelve thousand, five hundred fifty-five".