18748159609 has 4 divisors (see below), whose sum is σ = 18792905040. Its totient is φ = 18703414180.

The previous prime is 18748159561. The next prime is 18748159637. The reversal of 18748159609 is 90695184781.

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: 90695184781 = 2767 ⋅32777443.

It is not a de Polignac number, because 18748159609 - 2¹⁵ = 18748126841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18748159669) 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, 22372087 + ... + 22372924.

It is an arithmetic number, because the mean of its divisors is an integer number (4698226260).

Almost surely, 2^18748159609 is an apocalyptic number.

It is an amenable number.

18748159609 is a deficient number, since it is larger than the sum of its proper divisors (44745431).

18748159609 is an equidigital number, since it uses as much as digits as its factorization.

18748159609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44745430.

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 18748159609 in words is "eighteen billion, seven hundred forty-eight million, one hundred fifty-nine thousand, six hundred nine".