18055507 has 2 divisors, whose sum is σ = 18055508. Its totient is φ = 18055506.

The previous prime is 18055493. The next prime is 18055511. The reversal of 18055507 is 70555081.

It is a strong prime.

It is an emirp because it is prime and its reverse (70555081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18055507 - 2¹⁹ = 17531219 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18055517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027753 + 9027754.

It is an arithmetic number, because the mean of its divisors is an integer number (9027754).

Almost surely, 2^18055507 is an apocalyptic number.

18055507 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055507 is an equidigital number, since it uses as much as digits as its factorization.

18055507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 18055507 is about 4249.1772144734. The cubic root of 18055507 is about 262.3432509376.

It can be divided in two parts, 1 and 8055507, that added together give a palindrome (8055508).

The spelling of 18055507 in words is "eighteen million, fifty-five thousand, five hundred seven".