18185358572 has 12 divisors (see below), whose sum is σ = 33208046256. Its totient is φ = 8697345360.

The previous prime is 18185358563. The next prime is 18185358577. The reversal of 18185358572 is 27585358181.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18185358577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98833379 + ... + 98833562.

It is an arithmetic number, because the mean of its divisors is an integer number (2767337188).

Almost surely, 2^18185358572 is an apocalyptic number.

It is an amenable number.

18185358572 is a deficient number, since it is larger than the sum of its proper divisors (15022687684).

18185358572 is a wasteful number, since it uses less digits than its factorization.

18185358572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197666968 (or 197666966 counting only the distinct ones).

The product of its digits is 2688000, while the sum is 53.

The spelling of 18185358572 in words is "eighteen billion, one hundred eighty-five million, three hundred fifty-eight thousand, five hundred seventy-two".