161166565 has 8 divisors (see below), whose sum is σ = 221028480. Its totient is φ = 110514192.

The previous prime is 161166559. The next prime is 161166571. The reversal of 161166565 is 565661161.

It is an interprime number because it is at equal distance from previous prime (161166559) and next prime (161166571).

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 161166565 - 2⁷ = 161166437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302345 + ... + 2302414.

It is an arithmetic number, because the mean of its divisors is an integer number (27628560).

Almost surely, 2^161166565 is an apocalyptic number.

It is an amenable number.

161166565 is a deficient number, since it is larger than the sum of its proper divisors (59861915).

161166565 is an equidigital number, since it uses as much as digits as its factorization.

161166565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4604771.

The product of its digits is 32400, while the sum is 37.

The square root of 161166565 is about 12695.1394242048. The cubic root of 161166565 is about 544.1997232426.

The spelling of 161166565 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred sixty-five".