18747874666 has 8 divisors (see below), whose sum is σ = 28223335620. Its totient is φ = 9340096128.

The previous prime is 18747874661. The next prime is 18747874687. The reversal of 18747874666 is 66647874781.

It can be written as a sum of positive squares in 2 ways, for example, as 16922107225 + 1825767441 = 130085^2 + 42729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18747874666² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18747874598 and 18747874607.

It is not an unprimeable number, because it can be changed into a prime (18747874661) 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, 16919911 + ... + 16921018.

Almost surely, 2^18747874666 is an apocalyptic number.

18747874666 is a deficient number, since it is larger than the sum of its proper divisors (9475460954).

18747874666 is a wasteful number, since it uses less digits than its factorization.

18747874666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33841208.

The product of its digits is 75866112, while the sum is 64.

It can be divided in two parts, 187478 and 74666, that added together give a 18-th power (262144 = 2¹⁸).

The spelling of 18747874666 in words is "eighteen billion, seven hundred forty-seven million, eight hundred seventy-four thousand, six hundred sixty-six".