2155534663 has 4 divisors (see below), whose sum is σ = 2176462288. Its totient is φ = 2134607040.

The previous prime is 2155534643. The next prime is 2155534673. The reversal of 2155534663 is 3664355512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155534663 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 (2155534643) 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, 10463658 + ... + 10463863.

It is an arithmetic number, because the mean of its divisors is an integer number (544115572).

Almost surely, 2^2155534663 is an apocalyptic number.

2155534663 is a deficient number, since it is larger than the sum of its proper divisors (20927625).

2155534663 is a wasteful number, since it uses less digits than its factorization.

2155534663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20927624.

The product of its digits is 324000, while the sum is 40.

The square root of 2155534663 is about 46427.7359236911. The cubic root of 2155534663 is about 1291.7694331074.

The spelling of 2155534663 in words is "two billion, one hundred fifty-five million, five hundred thirty-four thousand, six hundred sixty-three".