18908709093 has 10 divisors (see below), whose sum is σ = 28246343334. Its totient is φ = 12605806008.

The previous prime is 18908709059. The next prime is 18908709109. The reversal of 18908709093 is 39090780981.

It can be written as a sum of positive squares in only one way, i.e., 17555720004 + 1352989089 = 132498^2 + 36783^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18908709093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18908709293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116720346 + ... + 116720507.

Almost surely, 2^18908709093 is an apocalyptic number.

It is an amenable number.

18908709093 is a deficient number, since it is larger than the sum of its proper divisors (9337634241).

18908709093 is an equidigital number, since it uses as much as digits as its factorization.

18908709093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233440865 (or 233440856 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 18908709093 in words is "eighteen billion, nine hundred eight million, seven hundred nine thousand, ninety-three".