18209609774 has 4 divisors (see below), whose sum is σ = 27314414664. Its totient is φ = 9104804886.

The previous prime is 18209609729. The next prime is 18209609797. The reversal of 18209609774 is 47790690281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47790690281 = 577 ⋅82826153.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4552402442 + ... + 4552402445.

It is an arithmetic number, because the mean of its divisors is an integer number (6828603666).

Almost surely, 2^18209609774 is an apocalyptic number.

18209609774 is a deficient number, since it is larger than the sum of its proper divisors (9104804890).

18209609774 is an equidigital number, since it uses as much as digits as its factorization.

18209609774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104804889.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 18209609774 in words is "eighteen billion, two hundred nine million, six hundred nine thousand, seven hundred seventy-four".