18468553 has 8 divisors (see below), whose sum is σ = 18687240. Its totient is φ = 18251520.

The previous prime is 18468547. The next prime is 18468577. The reversal of 18468553 is 35586481.

It can be written as a sum of positive squares in 4 ways, for example, as 7795264 + 10673289 = 2792^2 + 3267^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18468553 - 2²¹ = 16371401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18468503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47283 + ... + 47671.

It is an arithmetic number, because the mean of its divisors is an integer number (2335905).

Almost surely, 2^18468553 is an apocalyptic number.

It is an amenable number.

18468553 is a deficient number, since it is larger than the sum of its proper divisors (218687).

18468553 is a wasteful number, since it uses less digits than its factorization.

18468553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its digits is 115200, while the sum is 40.

The square root of 18468553 is about 4297.5054392054. The cubic root of 18468553 is about 264.3286817197.

The spelling of 18468553 in words is "eighteen million, four hundred sixty-eight thousand, five hundred fifty-three".