18705966855 has 16 divisors (see below), whose sum is σ = 30625584000. Its totient is φ = 9744503328.

The previous prime is 18705966821. The next prime is 18705966859. The reversal of 18705966855 is 55866950781.

It is a de Polignac number, because none of the positive numbers 2^k-18705966855 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705966859) 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 15 ways as a sum of consecutive naturals, for example, 14500105 + ... + 14501394.

It is an arithmetic number, because the mean of its divisors is an integer number (1914099000).

Almost surely, 2^18705966855 is an apocalyptic number.

18705966855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18705966855 is a deficient number, since it is larger than the sum of its proper divisors (11919617145).

18705966855 is a wasteful number, since it uses less digits than its factorization.

18705966855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29001550.

The product of its (nonzero) digits is 18144000, while the sum is 60.

The spelling of 18705966855 in words is "eighteen billion, seven hundred five million, nine hundred sixty-six thousand, eight hundred fifty-five".