18496823405 has 4 divisors (see below), whose sum is σ = 22196188092. Its totient is φ = 14797458720.

The previous prime is 18496823381. The next prime is 18496823419. The reversal of 18496823405 is 50432869481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50432869481 = 73547 ⋅685723.

It can be written as a sum of positive squares in 2 ways, for example, as 6647630089 + 11849193316 = 81533^2 + 108854^2 .

It is not a de Polignac number, because 18496823405 - 2¹⁰ = 18496822381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1849682336 + ... + 1849682345.

It is an arithmetic number, because the mean of its divisors is an integer number (5549047023).

Almost surely, 2^18496823405 is an apocalyptic number.

It is an amenable number.

18496823405 is a deficient number, since it is larger than the sum of its proper divisors (3699364687).

18496823405 is an equidigital number, since it uses as much as digits as its factorization.

18496823405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699364686.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 18496823405 in words is "eighteen billion, four hundred ninety-six million, eight hundred twenty-three thousand, four hundred five".