18975546224649 has 27 divisors (see below), whose sum is σ = 31884234779943. Its totient is φ = 10843116998112.

The previous prime is 18975546224647. The next prime is 18975546224693. The reversal of 18975546224649 is 94642264557981.

The square root of 18975546224649 is 4356093.

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

18975546224649 is a `hidden beast` number, since 1 + 8 + 9 + 7 + 554 + 6 + 2 + 2 + 4 + 64 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7883768918025 + 11091777306624 = 2807805^2 + 3330432^2 .

It is not a de Polignac number, because 18975546224649 - 2¹ = 18975546224647 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18975546224647) 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, 91374237 + ... + 91581669.

Almost surely, 2^{18975546224649} is an apocalyptic number.

18975546224649 is the 4356093-rd square number.

18975546224649 is the 2178047-th centered octagonal number.

It is an amenable number.

18975546224649 is a deficient number, since it is larger than the sum of its proper divisors (12908688555294).

18975546224649 is an frugal number, since it uses more digits than its factorization.

18975546224649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414886 (or 207443 counting only the distinct ones).

The product of its digits is 1045094400, while the sum is 72.

The spelling of 18975546224649 in words is "eighteen trillion, nine hundred seventy-five billion, five hundred forty-six million, two hundred twenty-four thousand, six hundred forty-nine".