18061231755959 has 4 divisors (see below), whose sum is σ = 20641407721104. Its totient is φ = 15481055790816.

The previous prime is 18061231755949. The next prime is 18061231755961. The reversal of 18061231755959 is 95955713216081.

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

It is not a de Polignac number, because 18061231755959 - 2²⁸ = 18060963320503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18061231755949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290087982562 + ... + 1290087982575.

It is an arithmetic number, because the mean of its divisors is an integer number (5160351930276).

Almost surely, 2^{18061231755959} is an apocalyptic number.

18061231755959 is a deficient number, since it is larger than the sum of its proper divisors (2580175965145).

18061231755959 is an equidigital number, since it uses as much as digits as its factorization.

18061231755959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580175965144.

The product of its (nonzero) digits is 20412000, while the sum is 62.

The spelling of 18061231755959 in words is "eighteen trillion, sixty-one billion, two hundred thirty-one million, seven hundred fifty-five thousand, nine hundred fifty-nine".