18149908993441 has 3 divisors (see below), whose sum is σ = 18149913253713. Its totient is φ = 18149904733170.

The previous prime is 18149908993439. The next prime is 18149908993453. The reversal of 18149908993441 is 14439980994181.

The square root of 18149908993441 is 4260271.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 18149908993441 - 2¹ = 18149908993439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18149908993421) 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 2 ways as a sum of consecutive naturals, for example, 2130136 + ... + 6390406.

It is an arithmetic number, because the mean of its divisors is an integer number (6049971084571).

Almost surely, 2^{18149908993441} is an apocalyptic number.

18149908993441 is the 4260271-st square number.

18149908993441 is the 2130136-th centered octagonal number.

It is an amenable number.

18149908993441 is a deficient number, since it is larger than the sum of its proper divisors (4260272).

18149908993441 is an frugal number, since it uses more digits than its factorization.

18149908993441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8520542 (or 4260271 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 70.

The spelling of 18149908993441 in words is "eighteen trillion, one hundred forty-nine billion, nine hundred eight million, nine hundred ninety-three thousand, four hundred forty-one".