1671445563 has 4 divisors (see below), whose sum is σ = 2228594088. Its totient is φ = 1114297040.

The previous prime is 1671445549. The next prime is 1671445579. The reversal of 1671445563 is 3655441761.

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 1671445563 - 2¹⁶ = 1671380027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1671445513) 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, 278574258 + ... + 278574263.

It is an arithmetic number, because the mean of its divisors is an integer number (557148522).

Almost surely, 2^1671445563 is an apocalyptic number.

1671445563 is a deficient number, since it is larger than the sum of its proper divisors (557148525).

1671445563 is an equidigital number, since it uses as much as digits as its factorization.

1671445563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557148524.

The product of its digits is 302400, while the sum is 42.

The square root of 1671445563 is about 40883.3164383713. The cubic root of 1671445563 is about 1186.7632217528.

The spelling of 1671445563 in words is "one billion, six hundred seventy-one million, four hundred forty-five thousand, five hundred sixty-three".