18790935547 has 4 divisors (see below), whose sum is σ = 19109426040. Its totient is φ = 18472445056.

The previous prime is 18790935521. The next prime is 18790935557. The reversal of 18790935547 is 74553909781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74553909781 = 13 ⋅5734916137.

It is a cyclic number.

It is not a de Polignac number, because 18790935547 - 2¹⁹ = 18790411259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18790935491 and 18790935500.

It is not an unprimeable number, because it can be changed into a prime (18790935557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159245158 + ... + 159245275.

It is an arithmetic number, because the mean of its divisors is an integer number (4777356510).

Almost surely, 2^18790935547 is an apocalyptic number.

18790935547 is a deficient number, since it is larger than the sum of its proper divisors (318490493).

18790935547 is an equidigital number, since it uses as much as digits as its factorization.

18790935547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318490492.

The product of its (nonzero) digits is 9525600, while the sum is 58.

The spelling of 18790935547 in words is "eighteen billion, seven hundred ninety million, nine hundred thirty-five thousand, five hundred forty-seven".