18601938612 has 18 divisors (see below), whose sum is σ = 47021567138. Its totient is φ = 6200646192.

The previous prime is 18601938599. The next prime is 18601938631. The reversal of 18601938612 is 21683910681.

18601938612 is a `hidden beast` number, since 1 + 8 + 601 + 9 + 38 + 6 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10544003856 + 8057934756 = 102684^2 + 89766^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258360223 + ... + 258360294.

Almost surely, 2^18601938612 is an apocalyptic number.

18601938612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18601938612 is an abundant number, since it is smaller than the sum of its proper divisors (28419628526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18601938612 is a wasteful number, since it uses less digits than its factorization.

18601938612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516720527 (or 516720522 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 18601938612 in words is "eighteen billion, six hundred one million, nine hundred thirty-eight thousand, six hundred twelve".