18666574533 has 12 divisors (see below), whose sum is σ = 26964067468. Its totient is φ = 12443811840.

The previous prime is 18666574483. The next prime is 18666574547. The reversal of 18666574533 is 33547566681.

It can be written as a sum of positive squares in 2 ways, for example, as 9809317764 + 8857256769 = 99042^2 + 94113^2 .

It is not a de Polignac number, because 18666574533 - 2¹⁸ = 18666312389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18666574533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18666574733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273093 + ... + 334533.

Almost surely, 2^18666574533 is an apocalyptic number.

It is an amenable number.

18666574533 is a deficient number, since it is larger than the sum of its proper divisors (8297492935).

18666574533 is a wasteful number, since it uses less digits than its factorization.

18666574533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95204 (or 95201 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 18666574533 in words is "eighteen billion, six hundred sixty-six million, five hundred seventy-four thousand, five hundred thirty-three".