18166685753539 has 4 divisors (see below), whose sum is σ = 18192601140480. Its totient is φ = 18140770366600.

The previous prime is 18166685753473. The next prime is 18166685753549. The reversal of 18166685753539 is 93535758666181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18166685753539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18166685753549) 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 3 ways as a sum of consecutive naturals, for example, 12957692419 + ... + 12957693820.

It is an arithmetic number, because the mean of its divisors is an integer number (4548150285120).

Almost surely, 2^{18166685753539} is an apocalyptic number.

18166685753539 is a deficient number, since it is larger than the sum of its proper divisors (25915386941).

18166685753539 is an equidigital number, since it uses as much as digits as its factorization.

18166685753539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25915386940.

The product of its digits is 979776000, while the sum is 73.

The spelling of 18166685753539 in words is "eighteen trillion, one hundred sixty-six billion, six hundred eighty-five million, seven hundred fifty-three thousand, five hundred thirty-nine".