18579171109 has 4 divisors (see below), whose sum is σ = 19557022240. Its totient is φ = 17601319980.

The previous prime is 18579171097. The next prime is 18579171113. The reversal of 18579171109 is 90117197581.

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 18579171109 - 2¹¹ = 18579169061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18579171119) 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, 488925537 + ... + 488925574.

It is an arithmetic number, because the mean of its divisors is an integer number (4889255560).

Almost surely, 2^18579171109 is an apocalyptic number.

18579171109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18579171109 is a deficient number, since it is larger than the sum of its proper divisors (977851131).

18579171109 is an equidigital number, since it uses as much as digits as its factorization.

18579171109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977851130.

The product of its (nonzero) digits is 158760, while the sum is 49.

The spelling of 18579171109 in words is "eighteen billion, five hundred seventy-nine million, one hundred seventy-one thousand, one hundred nine".