18550505 has 16 divisors (see below), whose sum is σ = 23023440. Its totient is φ = 14337792.

The previous prime is 18550457. The next prime is 18550507. The reversal of 18550505 is 50505581.

It can be written as a sum of positive squares in 8 ways, for example, as 6744409 + 11806096 = 2597^2 + 3436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18550505 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18550507) 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 15 ways as a sum of consecutive naturals, for example, 36191 + ... + 36699.

It is an arithmetic number, because the mean of its divisors is an integer number (1438965).

Almost surely, 2^18550505 is an apocalyptic number.

It is an amenable number.

18550505 is a deficient number, since it is larger than the sum of its proper divisors (4472935).

18550505 is a wasteful number, since it uses less digits than its factorization.

18550505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 18550505 is about 4307.0297189595. The cubic root of 18550505 is about 264.7190804990.

The spelling of 18550505 in words is "eighteen million, five hundred fifty thousand, five hundred five".