18885571093 has 2 divisors, whose sum is σ = 18885571094. Its totient is φ = 18885571092.

The previous prime is 18885571063. The next prime is 18885571127. The reversal of 18885571093 is 39017558881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11603167524 + 7282403569 = 107718^2 + 85337^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18885571093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18885571063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442785546 + 9442785547.

It is an arithmetic number, because the mean of its divisors is an integer number (9442785547).

Almost surely, 2^18885571093 is an apocalyptic number.

It is an amenable number.

18885571093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885571093 is an equidigital number, since it uses as much as digits as its factorization.

18885571093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 55.

The spelling of 18885571093 in words is "eighteen billion, eight hundred eighty-five million, five hundred seventy-one thousand, ninety-three".