18804564731 has 2 divisors, whose sum is σ = 18804564732. Its totient is φ = 18804564730.

The previous prime is 18804564719. The next prime is 18804564769. The reversal of 18804564731 is 13746540881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18804564731 - 2¹⁰ = 18804563707 is a prime.

It is a super-2 number, since 2×18804564731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18804564791) 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 as a sum of consecutive naturals, namely, 9402282365 + 9402282366.

It is an arithmetic number, because the mean of its divisors is an integer number (9402282366).

Almost surely, 2^18804564731 is an apocalyptic number.

18804564731 is a deficient number, since it is larger than the sum of its proper divisors (1).

18804564731 is an equidigital number, since it uses as much as digits as its factorization.

18804564731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 18804564731 in words is "eighteen billion, eight hundred four million, five hundred sixty-four thousand, seven hundred thirty-one".