18161266 has 8 divisors (see below), whose sum is σ = 27343980. Its totient is φ = 9046608.

The previous prime is 18161261. The next prime is 18161309. The reversal of 18161266 is 66216181.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 697225 = 4179^2 + 835^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18161261) 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, 16341 + ... + 17416.

Almost surely, 2^18161266 is an apocalyptic number.

18161266 is a deficient number, since it is larger than the sum of its proper divisors (9182714).

18161266 is a wasteful number, since it uses less digits than its factorization.

18161266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34028.

The product of its digits is 3456, while the sum is 31.

The square root of 18161266 is about 4261.6036887538. The cubic root of 18161266 is about 262.8544737948.

The spelling of 18161266 in words is "eighteen million, one hundred sixty-one thousand, two hundred sixty-six".