51040440999 has 12 divisors (see below), whose sum is σ = 73738598856. Its totient is φ = 34020721872.

The previous prime is 51040440967. The next prime is 51040441027. The reversal of 51040440999 is 99904404015.

51040440999 is a `hidden beast` number, since 510 + 4 + 0 + 4 + 40 + 9 + 99 = 666.

It is not a de Polignac number, because 51040440999 - 2⁵ = 51040440967 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51040440929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467812 + ... + 566505.

It is an arithmetic number, because the mean of its divisors is an integer number (6144883238).

Almost surely, 2^51040440999 is an apocalyptic number.

51040440999 is a deficient number, since it is larger than the sum of its proper divisors (22698157857).

51040440999 is a wasteful number, since it uses less digits than its factorization.

51040440999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039806 (or 1039803 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 51040440999 in words is "fifty-one billion, forty million, four hundred forty thousand, nine hundred ninety-nine".