18119044449 has 27 divisors (see below), whose sum is σ = 28774573009. Its totient is φ = 10978546920.

The previous prime is 18119044429. The next prime is 18119044469. The reversal of 18119044449 is 94444091181.

It is a happy number.

The square root of 18119044449 is 134607.

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

18119044449 is a `hidden beast` number, since 1 + 81 + 1 + 90 + 44 + 449 = 666.

It is an interprime number because it is at equal distance from previous prime (18119044429) and next prime (18119044469).

It is not a de Polignac number, because 18119044449 - 2⁵ = 18119044417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18119044429) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4439992 + ... + 4444070.

Almost surely, 2^18119044449 is an apocalyptic number.

18119044449 is the 134607-th square number.

18119044449 is the 67304-th centered octagonal number.

It is an amenable number.

18119044449 is a deficient number, since it is larger than the sum of its proper divisors (10655528560).

18119044449 is an frugal number, since it uses more digits than its factorization.

18119044449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8186 (or 4093 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 18119044449 in words is "eighteen billion, one hundred nineteen million, forty-four thousand, four hundred forty-nine".