155564 has 6 divisors (see below), whose sum is σ = 272244. Its totient is φ = 77780.

The previous prime is 155557. The next prime is 155569. The reversal of 155564 is 465551.

It is not an unprimeable number, because it can be changed into a prime (155569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19442 + ... + 19449.

It is an arithmetic number, because the mean of its divisors is an integer number (45374).

2¹⁵⁵⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

155564 is a deficient number, since it is larger than the sum of its proper divisors (116680).

155564 is a wasteful number, since it uses less digits than its factorization.

155564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38895 (or 38893 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 155564 is about 394.4160240153. The cubic root of 155564 is about 53.7819280291.

The spelling of 155564 in words is "one hundred fifty-five thousand, five hundred sixty-four".