18023477813 has 4 divisors (see below), whose sum is σ = 19661975808. Its totient is φ = 16384979820.

The previous prime is 18023477783. The next prime is 18023477819. The reversal of 18023477813 is 31877432081.

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 not a de Polignac number, because 18023477813 - 2³² = 13728510517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18023477819) 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, 819248981 + ... + 819249002.

It is an arithmetic number, because the mean of its divisors is an integer number (4915493952).

Almost surely, 2^18023477813 is an apocalyptic number.

It is an amenable number.

18023477813 is a deficient number, since it is larger than the sum of its proper divisors (1638497995).

18023477813 is a wasteful number, since it uses less digits than its factorization.

18023477813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638497994.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 18023477813 in words is "eighteen billion, twenty-three million, four hundred seventy-seven thousand, eight hundred thirteen".