18817351449 has 16 divisors (see below), whose sum is σ = 27400351104. Its totient is φ = 11416809600.

The previous prime is 18817351433. The next prime is 18817351471. The reversal of 18817351449 is 94415371881.

It is not a de Polignac number, because 18817351449 - 2⁴ = 18817351433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18817351549) 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 15 ways as a sum of consecutive naturals, for example, 3395092 + ... + 3400629.

It is an arithmetic number, because the mean of its divisors is an integer number (1712521944).

Almost surely, 2^18817351449 is an apocalyptic number.

It is an amenable number.

18817351449 is a deficient number, since it is larger than the sum of its proper divisors (8582999655).

18817351449 is a wasteful number, since it uses less digits than its factorization.

18817351449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6795808.

The product of its digits is 967680, while the sum is 51.

The spelling of 18817351449 in words is "eighteen billion, eight hundred seventeen million, three hundred fifty-one thousand, four hundred forty-nine".