18450770813 has 4 divisors (see below), whose sum is σ = 18726155520. Its totient is φ = 18175386108.

The previous prime is 18450770801. The next prime is 18450770869. The reversal of 18450770813 is 31807705481.

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 18450770813 - 2⁶ = 18450770749 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 (18450778813) 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, 137692253 + ... + 137692386.

It is an arithmetic number, because the mean of its divisors is an integer number (4681538880).

Almost surely, 2^18450770813 is an apocalyptic number.

It is an amenable number.

18450770813 is a deficient number, since it is larger than the sum of its proper divisors (275384707).

18450770813 is an equidigital number, since it uses as much as digits as its factorization.

18450770813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275384706.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 18450770813 in words is "eighteen billion, four hundred fifty million, seven hundred seventy thousand, eight hundred thirteen".