161366 has 4 divisors (see below), whose sum is σ = 242052. Its totient is φ = 80682.

The previous prime is 161363. The next prime is 161377. The reversal of 161366 is 663161.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40340 + ... + 40343.

It is an arithmetic number, because the mean of its divisors is an integer number (60513).

2¹⁶¹³⁶⁶ is an apocalyptic number.

161366 is a deficient number, since it is larger than the sum of its proper divisors (80686).

161366 is an equidigital number, since it uses as much as digits as its factorization.

161366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80685.

The product of its digits is 648, while the sum is 23.

The square root of 161366 is about 401.7038710294. The cubic root of 161366 is about 54.4424103394.

The spelling of 161366 in words is "one hundred sixty-one thousand, three hundred sixty-six".