18480171977 has 8 divisors (see below), whose sum is σ = 18513809160. Its totient is φ = 18446561280.

The previous prime is 18480171967. The next prime is 18480172037. The reversal of 18480171977 is 77917108481.

It can be written as a sum of positive squares in 4 ways, for example, as 23319241 + 18456852736 = 4829^2 + 135856^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18480171977 - 2²⁰ = 18479123401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18480171937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1825943 + ... + 1836035.

It is an arithmetic number, because the mean of its divisors is an integer number (2314226145).

Almost surely, 2^18480171977 is an apocalyptic number.

It is an amenable number.

18480171977 is a deficient number, since it is larger than the sum of its proper divisors (33637183).

18480171977 is a wasteful number, since it uses less digits than its factorization.

18480171977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243.

The product of its (nonzero) digits is 790272, while the sum is 53.

The spelling of 18480171977 in words is "eighteen billion, four hundred eighty million, one hundred seventy-one thousand, nine hundred seventy-seven".