18489176479 has 2 divisors, whose sum is σ = 18489176480. Its totient is φ = 18489176478.

The previous prime is 18489176477. The next prime is 18489176513. The reversal of 18489176479 is 97467198481.

It is a weak prime.

It is an emirp because it is prime and its reverse (97467198481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18489176479 - 2¹ = 18489176477 is a prime.

Together with 18489176477, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18489176479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18489176473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9244588239 + 9244588240.

It is an arithmetic number, because the mean of its divisors is an integer number (9244588240).

Almost surely, 2^18489176479 is an apocalyptic number.

18489176479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489176479 is an equidigital number, since it uses as much as digits as its factorization.

18489176479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24385536, while the sum is 64.

The spelling of 18489176479 in words is "eighteen billion, four hundred eighty-nine million, one hundred seventy-six thousand, four hundred seventy-nine".