18808356345 has 16 divisors (see below), whose sum is σ = 30104609472. Its totient is φ = 10027376960.

The previous prime is 18808356313. The next prime is 18808356517. The reversal of 18808356345 is 54365380881.

It is a happy number.

It is not a de Polignac number, because 18808356345 - 2⁵ = 18808356313 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192411 + ... + 273200.

It is an arithmetic number, because the mean of its divisors is an integer number (1881538092).

Almost surely, 2^18808356345 is an apocalyptic number.

18808356345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18808356345 is a deficient number, since it is larger than the sum of its proper divisors (11296253127).

18808356345 is a wasteful number, since it uses less digits than its factorization.

18808356345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468312.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 18808356345 in words is "eighteen billion, eight hundred eight million, three hundred fifty-six thousand, three hundred forty-five".