18240344277121 has 4 divisors (see below), whose sum is σ = 18379583546544. Its totient is φ = 18101105007700.

The previous prime is 18240344277091. The next prime is 18240344277137. The reversal of 18240344277121 is 12177244304281.

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 a cyclic number.

It is not a de Polignac number, because 18240344277121 - 2²³ = 18240335888513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240344277521) 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, 69619634515 + ... + 69619634776.

It is an arithmetic number, because the mean of its divisors is an integer number (4594895886636).

Almost surely, 2^{18240344277121} is an apocalyptic number.

It is an amenable number.

18240344277121 is a deficient number, since it is larger than the sum of its proper divisors (139239269423).

18240344277121 is a wasteful number, since it uses less digits than its factorization.

18240344277121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139239269422.

The product of its (nonzero) digits is 602112, while the sum is 46.

The spelling of 18240344277121 in words is "eighteen trillion, two hundred forty billion, three hundred forty-four million, two hundred seventy-seven thousand, one hundred twenty-one".