11820509323 has 4 divisors (see below), whose sum is σ = 13509153520. Its totient is φ = 10131865128.

The previous prime is 11820509317. The next prime is 11820509333. The reversal of 11820509323 is 32390502811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32390502811 = 1201 ⋅26969611.

It is not a de Polignac number, because 11820509323 - 2¹³ = 11820501131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11820509333) 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, 844322088 + ... + 844322101.

It is an arithmetic number, because the mean of its divisors is an integer number (3377288380).

Almost surely, 2^11820509323 is an apocalyptic number.

11820509323 is a deficient number, since it is larger than the sum of its proper divisors (1688644197).

11820509323 is an equidigital number, since it uses as much as digits as its factorization.

11820509323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688644196.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 11820509323 in words is "eleven billion, eight hundred twenty million, five hundred nine thousand, three hundred twenty-three".