18061199479 has 4 divisors (see below), whose sum is σ = 18278804376. Its totient is φ = 17843594584.

The previous prime is 18061199407. The next prime is 18061199503. The reversal of 18061199479 is 97499116081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97499116081 = 31327 ⋅3112303.

It is a cyclic number.

It is not a de Polignac number, because 18061199479 - 2²³ = 18052810871 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 (18061169479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108802324 + ... + 108802489.

It is an arithmetic number, because the mean of its divisors is an integer number (4569701094).

Almost surely, 2^18061199479 is an apocalyptic number.

18061199479 is a deficient number, since it is larger than the sum of its proper divisors (217604897).

18061199479 is an equidigital number, since it uses as much as digits as its factorization.

18061199479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217604896.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 18061199479 in words is "eighteen billion, sixty-one million, one hundred ninety-nine thousand, four hundred seventy-nine".