18687244427204 has 24 divisors (see below), whose sum is σ = 33500918168088. Its totient is φ = 9115561877760.

The previous prime is 18687244427171. The next prime is 18687244427207. The reversal of 18687244427204 is 40272444278681.

It can be written as a sum of positive squares in 4 ways, for example, as 1264567720900 + 17422676706304 = 1124530^2 + 4174048^2 .

It is not an unprimeable number, because it can be changed into a prime (18687244427207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8176274 + ... + 10209110.

It is an arithmetic number, because the mean of its divisors is an integer number (1395871590337).

Almost surely, 2^{18687244427204} is an apocalyptic number.

It is an amenable number.

18687244427204 is a deficient number, since it is larger than the sum of its proper divisors (14813673740884).

18687244427204 is a wasteful number, since it uses less digits than its factorization.

18687244427204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088935 (or 2088933 counting only the distinct ones).

The product of its (nonzero) digits is 38535168, while the sum is 59.

The spelling of 18687244427204 in words is "eighteen trillion, six hundred eighty-seven billion, two hundred forty-four million, four hundred twenty-seven thousand, two hundred four".