2155663 has 4 divisors (see below), whose sum is σ = 2159320. Its totient is φ = 2152008.

The previous prime is 2155661. The next prime is 2155667. The reversal of 2155663 is 3665512.

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

It is a cyclic number.

It is not a de Polignac number, because 2155663 - 2¹ = 2155661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155661) 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, 720 + ... + 2197.

It is an arithmetic number, because the mean of its divisors is an integer number (539830).

2^2155663 is an apocalyptic number.

2155663 is a deficient number, since it is larger than the sum of its proper divisors (3657).

2155663 is an equidigital number, since it uses as much as digits as its factorization.

2155663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656.

The product of its digits is 5400, while the sum is 28.

The square root of 2155663 is about 1468.2176269205. The cubic root of 2155663 is about 129.1795069210.

The spelling of 2155663 in words is "two million, one hundred fifty-five thousand, six hundred sixty-three".