16998589081 has 4 divisors (see below), whose sum is σ = 16998896052. Its totient is φ = 16998282112.

The previous prime is 16998589057. The next prime is 16998589103. The reversal of 16998589081 is 18098589961.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9166339081 + 7832250000 = 95741^2 + 88500^2 .

It is a cyclic number.

It is not a de Polignac number, because 16998589081 - 2⁹ = 16998588569 is a prime.

It is a super-2 number, since 2×16998589081² (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 (16998589021) 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, 44740 + ... + 189733.

It is an arithmetic number, because the mean of its divisors is an integer number (4249724013).

Almost surely, 2^16998589081 is an apocalyptic number.

It is an amenable number.

16998589081 is a deficient number, since it is larger than the sum of its proper divisors (306971).

16998589081 is an equidigital number, since it uses as much as digits as its factorization.

16998589081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306970.

The product of its (nonzero) digits is 11197440, while the sum is 64.

The spelling of 16998589081 in words is "sixteen billion, nine hundred ninety-eight million, five hundred eighty-nine thousand, eighty-one".