1663447205 has 16 divisors (see below), whose sum is σ = 2283738624. Its totient is φ = 1139429760.

The previous prime is 1663447187. The next prime is 1663447213. The reversal of 1663447205 is 5027443661.

It is a happy number.

It is not a de Polignac number, because 1663447205 - 2²⁰ = 1662398629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8420 + ... + 58290.

It is an arithmetic number, because the mean of its divisors is an integer number (142733664).

Almost surely, 2^1663447205 is an apocalyptic number.

It is an amenable number.

1663447205 is a deficient number, since it is larger than the sum of its proper divisors (620291419).

1663447205 is an equidigital number, since it uses as much as digits as its factorization.

1663447205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50836.

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 1663447205 is about 40785.3797947255. The cubic root of 1663447205 is about 1184.8671906326.

The spelling of 1663447205 in words is "one billion, six hundred sixty-three million, four hundred forty-seven thousand, two hundred five".