18398105671681 has 8 divisors (see below), whose sum is σ = 18745381247040. Its totient is φ = 18050835337392.

The previous prime is 18398105671669. The next prime is 18398105671703. The reversal of 18398105671681 is 18617650189381.

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 18398105671681 - 2³¹ = 18395958188033 is a prime.

It is a super-2 number, since 2×18398105671681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18398105641681) 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, 6176710 + ... + 8657248.

It is an arithmetic number, because the mean of its divisors is an integer number (2343172655880).

Almost surely, 2^{18398105671681} is an apocalyptic number.

It is an amenable number.

18398105671681 is a deficient number, since it is larger than the sum of its proper divisors (347275575359).

18398105671681 is a wasteful number, since it uses less digits than its factorization.

18398105671681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620535.

The product of its (nonzero) digits is 17418240, while the sum is 64.

The spelling of 18398105671681 in words is "eighteen trillion, three hundred ninety-eight billion, one hundred five million, six hundred seventy-one thousand, six hundred eighty-one".