161718818266 has 8 divisors (see below), whose sum is σ = 242670928500. Its totient is φ = 80828508768.

The previous prime is 161718818243. The next prime is 161718818273. The reversal of 161718818266 is 662818817161.

It can be written as a sum of positive squares in 2 ways, for example, as 160256903041 + 1461915225 = 400321^2 + 38235^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15443641 + ... + 15454108.

Almost surely, 2^161718818266 is an apocalyptic number.

161718818266 is a deficient number, since it is larger than the sum of its proper divisors (80952110234).

161718818266 is a wasteful number, since it uses less digits than its factorization.

161718818266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30900368.

The product of its digits is 1548288, while the sum is 55.

The spelling of 161718818266 in words is "one hundred sixty-one billion, seven hundred eighteen million, eight hundred eighteen thousand, two hundred sixty-six".