155563 has 4 divisors (see below), whose sum is σ = 157768. Its totient is φ = 153360.

The previous prime is 155557. The next prime is 155569. The reversal of 155563 is 365551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365551 = 17 ⋅21503.

It is an interprime number because it is at equal distance from previous prime (155557) and next prime (155569).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155563 is a prime.

It is a Duffinian number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (39442).

2¹⁵⁵⁵⁶³ is an apocalyptic number.

155563 is a deficient number, since it is larger than the sum of its proper divisors (2205).

155563 is an equidigital number, since it uses as much as digits as its factorization.

155563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204.

The product of its digits is 2250, while the sum is 25.

The square root of 155563 is about 394.4147563162. The cubic root of 155563 is about 53.7818127881.

The spelling of 155563 in words is "one hundred fifty-five thousand, five hundred sixty-three".