18123539077 has 4 divisors (see below), whose sum is σ = 20712616096. Its totient is φ = 15534462060.

The previous prime is 18123539069. The next prime is 18123539089. The reversal of 18123539077 is 77093532181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18123539077 - 2³ = 18123539069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18123539377) 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, 1294538499 + ... + 1294538512.

It is an arithmetic number, because the mean of its divisors is an integer number (5178154024).

Almost surely, 2^18123539077 is an apocalyptic number.

It is an amenable number.

18123539077 is a deficient number, since it is larger than the sum of its proper divisors (2589077019).

18123539077 is an equidigital number, since it uses as much as digits as its factorization.

18123539077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589077018.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 18123539077 in words is "eighteen billion, one hundred twenty-three million, five hundred thirty-nine thousand, seventy-seven".