18531111109852 has 24 divisors (see below), whose sum is σ = 35377991116272. Its totient is φ = 8423133427200.

The previous prime is 18531111109843. The next prime is 18531111109913. The reversal of 18531111109852 is 25890111113581.

It is a super-2 number, since 2×18531111109852² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1385452 + ... + 6243532.

It is an arithmetic number, because the mean of its divisors is an integer number (1474082963178).

Almost surely, 2^{18531111109852} is an apocalyptic number.

It is an amenable number.

18531111109852 is a deficient number, since it is larger than the sum of its proper divisors (16846880006420).

18531111109852 is a wasteful number, since it uses less digits than its factorization.

18531111109852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4944789 (or 4944787 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 46.

The spelling of 18531111109852 in words is "eighteen trillion, five hundred thirty-one billion, one hundred eleven million, one hundred nine thousand, eight hundred fifty-two".