18705129854 has 16 divisors (see below), whose sum is σ = 28134506400. Its totient is φ = 9326997504.

The previous prime is 18705129851. The next prime is 18705129857. The reversal of 18705129854 is 45892150781.

It is an interprime number because it is at equal distance from previous prime (18705129851) and next prime (18705129857).

It is a super-2 number, since 2×18705129854² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705129851) 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 7 ways as a sum of consecutive naturals, for example, 1109762 + ... + 1126490.

It is an arithmetic number, because the mean of its divisors is an integer number (1758406650).

Almost surely, 2^18705129854 is an apocalyptic number.

18705129854 is a deficient number, since it is larger than the sum of its proper divisors (9429376546).

18705129854 is a wasteful number, since it uses less digits than its factorization.

18705129854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18227.

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 18705129854 in words is "eighteen billion, seven hundred five million, one hundred twenty-nine thousand, eight hundred fifty-four".