18086553 has 12 divisors (see below), whose sum is σ = 26483860. Its totient is φ = 11892096.

The previous prime is 18086543. The next prime is 18086567. The reversal of 18086553 is 35568081.

It can be written as a sum of positive squares in 2 ways, for example, as 8277129 + 9809424 = 2877^2 + 3132^2 .

It is not a de Polignac number, because 18086553 - 2⁹ = 18086041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18086503) 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, 13108 + ... + 14421.

Almost surely, 2^18086553 is an apocalyptic number.

It is an amenable number.

18086553 is a deficient number, since it is larger than the sum of its proper divisors (8397307).

18086553 is a wasteful number, since it uses less digits than its factorization.

18086553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27608 (or 27605 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18086553 is about 4252.8288232658. The cubic root of 18086553 is about 262.4935290922.

The spelling of 18086553 in words is "eighteen million, eighty-six thousand, five hundred fifty-three".