161662665 has 8 divisors (see below), whose sum is σ = 258660288. Its totient is φ = 86220080.

The previous prime is 161662663. The next prime is 161662703. The reversal of 161662665 is 566266161.

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

It is not a de Polignac number, because 161662665 - 2¹ = 161662663 is a prime.

It is a super-2 number, since 2×161662665² = 52269634509804450, 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, 5388741 + ... + 5388770.

It is an arithmetic number, because the mean of its divisors is an integer number (32332536).

Almost surely, 2^161662665 is an apocalyptic number.

161662665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161662665 is a deficient number, since it is larger than the sum of its proper divisors (96997623).

161662665 is a wasteful number, since it uses less digits than its factorization.

161662665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10777519.

The product of its digits is 77760, while the sum is 39.

The square root of 161662665 is about 12714.6633852415. The cubic root of 161662665 is about 544.7575331957.

The spelling of 161662665 in words is "one hundred sixty-one million, six hundred sixty-two thousand, six hundred sixty-five".