18687337404448 has 48 divisors (see below), whose sum is σ = 37132651183320. Its totient is φ = 9256895778816.

The previous prime is 18687337404431. The next prime is 18687337404451. The reversal of 18687337404448 is 84440473378681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9473271425424 + 9214065979024 = 3077868^2 + 3035468^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7065886 + ... + 9343522.

Almost surely, 2^{18687337404448} is an apocalyptic number.

It is an amenable number.

18687337404448 is a deficient number, since it is larger than the sum of its proper divisors (18445313778872).

18687337404448 is a wasteful number, since it uses less digits than its factorization.

18687337404448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280029 (or 2280021 counting only the distinct ones).

The product of its (nonzero) digits is 346816512, while the sum is 67.

The spelling of 18687337404448 in words is "eighteen trillion, six hundred eighty-seven billion, three hundred thirty-seven million, four hundred four thousand, four hundred forty-eight".