18405132161 has 8 divisors (see below), whose sum is σ = 20986847784. Its totient is φ = 15989978880.

The previous prime is 18405132149. The next prime is 18405132217. The reversal of 18405132161 is 16123150481.

It can be written as a sum of positive squares in 4 ways, for example, as 594628225 + 17810503936 = 24385^2 + 133456^2 .

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 18405132161 - 2¹⁰ = 18405131137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18405131161) 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, 41640350 + ... + 41640791.

It is an arithmetic number, because the mean of its divisors is an integer number (2623355973).

Almost surely, 2^18405132161 is an apocalyptic number.

It is an amenable number.

18405132161 is a deficient number, since it is larger than the sum of its proper divisors (2581715623).

18405132161 is a wasteful number, since it uses less digits than its factorization.

18405132161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83281171.

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 18405132161 in words is "eighteen billion, four hundred five million, one hundred thirty-two thousand, one hundred sixty-one".