18261186512 has 10 divisors (see below), whose sum is σ = 35381048898. Its totient is φ = 9130593248.

The previous prime is 18261186511. The next prime is 18261186521. The reversal of 18261186512 is 21568116281.

It can be written as a sum of positive squares in only one way, i.e., 15484318096 + 2776868416 = 124436^2 + 52696^2 .

It is a super-2 number, since 2×18261186512² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18261186512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261186511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570662063 + ... + 570662094.

Almost surely, 2^18261186512 is an apocalyptic number.

It is an amenable number.

18261186512 is a deficient number, since it is larger than the sum of its proper divisors (17119862386).

18261186512 is a wasteful number, since it uses less digits than its factorization.

18261186512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141324165 (or 1141324159 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The spelling of 18261186512 in words is "eighteen billion, two hundred sixty-one million, one hundred eighty-six thousand, five hundred twelve".