18193929093 has 12 divisors (see below), whose sum is σ = 26775971820. Its totient is φ = 11900431296.

The previous prime is 18193929079. The next prime is 18193929139. The reversal of 18193929093 is 39092939181.

18193929093 is a `hidden beast` number, since 1 + 81 + 9 + 392 + 90 + 93 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5408425764 + 12785503329 = 73542^2 + 113073^2 .

It is not a de Polignac number, because 18193929093 - 2¹² = 18193924997 is a prime.

It is a super-2 number, since 2×18193929093² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18193929073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19070728 + ... + 19071681.

It is an arithmetic number, because the mean of its divisors is an integer number (2231330985).

Almost surely, 2^18193929093 is an apocalyptic number.

It is an amenable number.

18193929093 is a deficient number, since it is larger than the sum of its proper divisors (8582042727).

18193929093 is a wasteful number, since it uses less digits than its factorization.

18193929093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38142468 (or 38142465 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The spelling of 18193929093 in words is "eighteen billion, one hundred ninety-three million, nine hundred twenty-nine thousand, ninety-three".