18618371773 has 4 divisors (see below), whose sum is σ = 18799132768. Its totient is φ = 18437610780.

The previous prime is 18618371771. The next prime is 18618371777. The reversal of 18618371773 is 37717381681.

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: 37717381681 = 7 ⋅5388197383.

It is a cyclic number.

It is not a de Polignac number, because 18618371773 - 2¹ = 18618371771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18618371773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618371771) 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, 90380343 + ... + 90380548.

It is an arithmetic number, because the mean of its divisors is an integer number (4699783192).

Almost surely, 2^18618371773 is an apocalyptic number.

It is an amenable number.

18618371773 is a deficient number, since it is larger than the sum of its proper divisors (180760995).

18618371773 is a wasteful number, since it uses less digits than its factorization.

18618371773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180760994.

The product of its digits is 1185408, while the sum is 52.

The spelling of 18618371773 in words is "eighteen billion, six hundred eighteen million, three hundred seventy-one thousand, seven hundred seventy-three".