155663 has 2 divisors, whose sum is σ = 155664. Its totient is φ = 155662.

The previous prime is 155657. The next prime is 155671. The reversal of 155663 is 366551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155663 - 2⁶ = 155599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77831 + 77832.

It is an arithmetic number, because the mean of its divisors is an integer number (77832).

2¹⁵⁵⁶⁶³ is an apocalyptic number.

155663 is a deficient number, since it is larger than the sum of its proper divisors (1).

155663 is an equidigital number, since it uses as much as digits as its factorization.

155663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 26.

The square root of 155663 is about 394.5415060548. The cubic root of 155663 is about 53.7933344423.

It can be divided in two parts, 155 and 663, that added together give a palindrome (818).

The spelling of 155663 in words is "one hundred fifty-five thousand, six hundred sixty-three".