18447647955 has 16 divisors (see below), whose sum is σ = 32199531264. Its totient is φ = 8944314080.

The previous prime is 18447647887. The next prime is 18447647969. The reversal of 18447647955 is 55974674481.

It is not a de Polignac number, because 18447647955 - 2⁹ = 18447647443 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55901799 + ... + 55902128.

It is an arithmetic number, because the mean of its divisors is an integer number (2012470704).

Almost surely, 2^18447647955 is an apocalyptic number.

18447647955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18447647955 is a deficient number, since it is larger than the sum of its proper divisors (13751883309).

18447647955 is a wasteful number, since it uses less digits than its factorization.

18447647955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111803946.

The product of its digits is 33868800, while the sum is 60.

The spelling of 18447647955 in words is "eighteen billion, four hundred forty-seven million, six hundred forty-seven thousand, nine hundred fifty-five".