18810421829 has 2 divisors, whose sum is σ = 18810421830. Its totient is φ = 18810421828.

The previous prime is 18810421789. The next prime is 18810421879. The reversal of 18810421829 is 92812401881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17027640100 + 1782781729 = 130490^2 + 42223^2 .

It is a cyclic number.

It is not a de Polignac number, because 18810421829 - 2¹⁶ = 18810356293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18810421829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18810421879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405210914 + 9405210915.

It is an arithmetic number, because the mean of its divisors is an integer number (9405210915).

Almost surely, 2^18810421829 is an apocalyptic number.

It is an amenable number.

18810421829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18810421829 is an equidigital number, since it uses as much as digits as its factorization.

18810421829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 44.

The spelling of 18810421829 in words is "eighteen billion, eight hundred ten million, four hundred twenty-one thousand, eight hundred twenty-nine".