155966 has 4 divisors (see below), whose sum is σ = 233952. Its totient is φ = 77982.

The previous prime is 155921. The next prime is 156007. The reversal of 155966 is 669551.

155966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

155966 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38990 + ... + 38993.

It is an arithmetic number, because the mean of its divisors is an integer number (58488).

2¹⁵⁵⁹⁶⁶ is an apocalyptic number.

155966 is a deficient number, since it is larger than the sum of its proper divisors (77986).

155966 is an equidigital number, since it uses as much as digits as its factorization.

155966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77985.

The product of its digits is 8100, while the sum is 32.

The square root of 155966 is about 394.9253093941. The cubic root of 155966 is about 53.8282149558.

The spelling of 155966 in words is "one hundred fifty-five thousand, nine hundred sixty-six".