18687244427161 has 8 divisors (see below), whose sum is σ = 18693827731904. Its totient is φ = 18680661687600.

The previous prime is 18687244427149. The next prime is 18687244427171. The reversal of 18687244427161 is 16172444278681.

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

It is a cyclic number.

It is not a de Polignac number, because 18687244427161 - 2²⁹ = 18686707556249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18687244427161.

It is not an unprimeable number, because it can be changed into a prime (18687244427171) 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, 72503260 + ... + 72760546.

It is an arithmetic number, because the mean of its divisors is an integer number (2336728466488).

Almost surely, 2^{18687244427161} is an apocalyptic number.

It is an amenable number.

18687244427161 is a deficient number, since it is larger than the sum of its proper divisors (6583304743).

18687244427161 is a wasteful number, since it uses less digits than its factorization.

18687244427161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282591.

The product of its digits is 28901376, while the sum is 61.

The spelling of 18687244427161 in words is "eighteen trillion, six hundred eighty-seven billion, two hundred forty-four million, four hundred twenty-seven thousand, one hundred sixty-one".