18220805605 has 32 divisors (see below), whose sum is σ = 22799107584. Its totient is φ = 13968055296.

The previous prime is 18220805587. The next prime is 18220805609. The reversal of 18220805605 is 50650802281.

It is a cyclic number.

It is not a de Polignac number, because 18220805605 - 2²⁷ = 18086587877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220805609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7384582 + ... + 7387048.

It is an arithmetic number, because the mean of its divisors is an integer number (712472112).

Almost surely, 2^18220805605 is an apocalyptic number.

It is an amenable number.

18220805605 is a deficient number, since it is larger than the sum of its proper divisors (4578301979).

18220805605 is a wasteful number, since it uses less digits than its factorization.

18220805605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 18220805605 in words is "eighteen billion, two hundred twenty million, eight hundred five thousand, six hundred five".