18698089681 has 4 divisors (see below), whose sum is σ = 18698521072. Its totient is φ = 18697658292.

The previous prime is 18698089661. The next prime is 18698089769.

18698089681 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18698089681 - 2²¹ = 18695992529 is a prime.

It is a super-2 number, since 2×18698089681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18698089661) 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, 142371 + ... + 240136.

It is an arithmetic number, because the mean of its divisors is an integer number (4674630268).

Almost surely, 2^18698089681 is an apocalyptic number.

It is an amenable number.

18698089681 is a deficient number, since it is larger than the sum of its proper divisors (431391).

18698089681 is an equidigital number, since it uses as much as digits as its factorization.

18698089681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431390.

The product of its (nonzero) digits is 11943936, while the sum is 64.

The spelling of 18698089681 in words is "eighteen billion, six hundred ninety-eight million, eighty-nine thousand, six hundred eighty-one".