18210165993 has 12 divisors (see below), whose sum is σ = 26327565108. Its totient is φ = 12129037440.

The previous prime is 18210165937. The next prime is 18210165997. The reversal of 18210165993 is 39956101281.

It can be written as a sum of positive squares in 2 ways, for example, as 11230064784 + 6980101209 = 105972^2 + 83547^2 .

It is not a de Polignac number, because 18210165993 - 2⁶ = 18210165929 is a prime.

It is a super-2 number, since 2×18210165993² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18210165997) 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 in 11 ways as a sum of consecutive naturals, for example, 912348 + ... + 932093.

It is an arithmetic number, because the mean of its divisors is an integer number (2193963759).

Almost surely, 2^18210165993 is an apocalyptic number.

It is an amenable number.

18210165993 is a deficient number, since it is larger than the sum of its proper divisors (8117399115).

18210165993 is a wasteful number, since it uses less digits than its factorization.

18210165993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845544 (or 1845541 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 18210165993 in words is "eighteen billion, two hundred ten million, one hundred sixty-five thousand, nine hundred ninety-three".