18989146667 has 4 divisors (see below), whose sum is σ = 18998265000. Its totient is φ = 18980028336.

The previous prime is 18989146663. The next prime is 18989146699. The reversal of 18989146667 is 76664198981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18989146667 - 2² = 18989146663 is a prime.

It is a super-2 number, since 2×18989146667² (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 (18989146663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4556042 + ... + 4560207.

It is an arithmetic number, because the mean of its divisors is an integer number (4749566250).

Almost surely, 2^18989146667 is an apocalyptic number.

18989146667 is a deficient number, since it is larger than the sum of its proper divisors (9118333).

18989146667 is an equidigital number, since it uses as much as digits as its factorization.

18989146667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9118332.

The product of its digits is 31352832, while the sum is 65.

The spelling of 18989146667 in words is "eighteen billion, nine hundred eighty-nine million, one hundred forty-six thousand, six hundred sixty-seven".