18980008981 has 16 divisors (see below), whose sum is σ = 19765347840. Its totient is φ = 18214955200.

The previous prime is 18980008969. The next prime is 18980008997.

18980008981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18980008981 - 2¹¹ = 18980006933 is a prime.

It is a super-2 number, since 2×18980008981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980000981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422940 + ... + 465658.

It is an arithmetic number, because the mean of its divisors is an integer number (1235334240).

Almost surely, 2^18980008981 is an apocalyptic number.

It is an amenable number.

18980008981 is a deficient number, since it is larger than the sum of its proper divisors (785338859).

18980008981 is a wasteful number, since it uses less digits than its factorization.

18980008981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42956.

The product of its (nonzero) digits is 331776, while the sum is 52.

The spelling of 18980008981 in words is "eighteen billion, nine hundred eighty million, eight thousand, nine hundred eighty-one".