1566163223 has 4 divisors (see below), whose sum is σ = 1604362368. Its totient is φ = 1527964080.

The previous prime is 1566163213. The next prime is 1566163279. The reversal of 1566163223 is 3223616651.

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 1566163223 - 2⁸ = 1566162967 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 (1566163213) 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, 19099511 + ... + 19099592.

It is an arithmetic number, because the mean of its divisors is an integer number (401090592).

Almost surely, 2^1566163223 is an apocalyptic number.

1566163223 is a deficient number, since it is larger than the sum of its proper divisors (38199145).

1566163223 is an equidigital number, since it uses as much as digits as its factorization.

1566163223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38199144.

The product of its digits is 38880, while the sum is 35.

The square root of 1566163223 is about 39574.7801383659. The cubic root of 1566163223 is about 1161.3033366422.

Adding to 1566163223 its reverse (3223616651), we get a palindrome (4789779874).

The spelling of 1566163223 in words is "one billion, five hundred sixty-six million, one hundred sixty-three thousand, two hundred twenty-three".