18244561355 has 16 divisors (see below), whose sum is σ = 21987370944. Its totient is φ = 14533188480.

The previous prime is 18244561351. The next prime is 18244561399. The reversal of 18244561355 is 55316544281.

It is not a de Polignac number, because 18244561355 - 2² = 18244561351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18244561351) 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, 1114409 + ... + 1130661.

It is an arithmetic number, because the mean of its divisors is an integer number (1374210684).

Almost surely, 2^18244561355 is an apocalyptic number.

18244561355 is a deficient number, since it is larger than the sum of its proper divisors (3742809589).

18244561355 is a wasteful number, since it uses less digits than its factorization.

18244561355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17206.

The product of its digits is 576000, while the sum is 44.

The spelling of 18244561355 in words is "eighteen billion, two hundred forty-four million, five hundred sixty-one thousand, three hundred fifty-five".