18420255049 has 4 divisors (see below), whose sum is σ = 21051720064. Its totient is φ = 15788790036.

The previous prime is 18420255043. The next prime is 18420255059. The reversal of 18420255049 is 94055202481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94055202481 = 293 ⋅321007517.

It is a cyclic number.

It is not a de Polignac number, because 18420255049 - 2³ = 18420255041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18420255041) 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 in 3 ways as a sum of consecutive naturals, for example, 1315732497 + ... + 1315732510.

It is an arithmetic number, because the mean of its divisors is an integer number (5262930016).

Almost surely, 2^18420255049 is an apocalyptic number.

It is an amenable number.

18420255049 is a deficient number, since it is larger than the sum of its proper divisors (2631465015).

18420255049 is an equidigital number, since it uses as much as digits as its factorization.

18420255049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631465014.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 18420255049 in words is "eighteen billion, four hundred twenty million, two hundred fifty-five thousand, forty-nine".