15805138823 has 32 divisors (see below), whose sum is σ = 16868874240. Its totient is φ = 14786150400.

The previous prime is 15805138787. The next prime is 15805138837. The reversal of 15805138823 is 32883150851.

It is a cyclic number.

It is not a de Polignac number, because 15805138823 - 2⁶ = 15805138759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15805138883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41266490 + ... + 41266872.

It is an arithmetic number, because the mean of its divisors is an integer number (527152320).

Almost surely, 2^15805138823 is an apocalyptic number.

15805138823 is a deficient number, since it is larger than the sum of its proper divisors (1063735417).

15805138823 is a wasteful number, since it uses less digits than its factorization.

15805138823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 15805138823 in words is "fifteen billion, eight hundred five million, one hundred thirty-eight thousand, eight hundred twenty-three".