18036912981 has 4 divisors (see below), whose sum is σ = 24049217312. Its totient is φ = 12024608652.

The previous prime is 18036912979. The next prime is 18036913031. The reversal of 18036912981 is 18921963081.

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 not a de Polignac number, because 18036912981 - 2¹ = 18036912979 is a prime.

It is a super-2 number, since 2×18036912981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18036912981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18036912911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3006152161 + ... + 3006152166.

It is an arithmetic number, because the mean of its divisors is an integer number (6012304328).

Almost surely, 2^18036912981 is an apocalyptic number.

It is an amenable number.

18036912981 is a deficient number, since it is larger than the sum of its proper divisors (6012304331).

18036912981 is an equidigital number, since it uses as much as digits as its factorization.

18036912981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6012304330.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 18036912981 in words is "eighteen billion, thirty-six million, nine hundred twelve thousand, nine hundred eighty-one".