18687337404449 has 16 divisors (see below), whose sum is σ = 22252349212800. Its totient is φ = 15354120910464.

The previous prime is 18687337404431. The next prime is 18687337404451. The reversal of 18687337404449 is 94440473378681.

It is not a de Polignac number, because 18687337404449 - 2¹⁶ = 18687337338913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18687337404469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331107932 + ... + 331164365.

It is an arithmetic number, because the mean of its divisors is an integer number (1390771825800).

Almost surely, 2^{18687337404449} is an apocalyptic number.

It is an amenable number.

18687337404449 is a deficient number, since it is larger than the sum of its proper divisors (3565011808351).

18687337404449 is a wasteful number, since it uses less digits than its factorization.

18687337404449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662272472.

The product of its (nonzero) digits is 390168576, while the sum is 68.

The spelling of 18687337404449 in words is "eighteen trillion, six hundred eighty-seven billion, three hundred thirty-seven million, four hundred four thousand, four hundred forty-nine".