161662666 has 16 divisors (see below), whose sum is σ = 264761280. Its totient is φ = 73421280.

The previous prime is 161662663. The next prime is 161662703. The reversal of 161662666 is 666266161.

It is a super-2 number, since 2×161662666² = 52269635156455112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161662663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33115 + ... + 37681.

It is an arithmetic number, because the mean of its divisors is an integer number (16547580).

Almost surely, 2^161662666 is an apocalyptic number.

161662666 is a deficient number, since it is larger than the sum of its proper divisors (103098614).

161662666 is a wasteful number, since it uses less digits than its factorization.

161662666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6189.

The product of its digits is 93312, while the sum is 40.

The square root of 161662666 is about 12714.6634245661. The cubic root of 161662666 is about 544.7575343189.

The spelling of 161662666 in words is "one hundred sixty-one million, six hundred sixty-two thousand, six hundred sixty-six".