1663109965 has 16 divisors (see below), whose sum is σ = 2185652160. Its totient is φ = 1204817920.

The previous prime is 1663109897. The next prime is 1663109977. The reversal of 1663109965 is 5699013661.

It is not a de Polignac number, because 1663109965 - 2⁷ = 1663109837 is a prime.

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, 44695 + ... + 72964.

It is an arithmetic number, because the mean of its divisors is an integer number (136603260).

Almost surely, 2^1663109965 is an apocalyptic number.

It is an amenable number.

1663109965 is a deficient number, since it is larger than the sum of its proper divisors (522542195).

1663109965 is a wasteful number, since it uses less digits than its factorization.

1663109965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117932.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 1663109965 is about 40781.2452605361. The cubic root of 1663109965 is about 1184.7871136261.

It can be divided in two parts, 1663 and 109965, that added together give a triangular number (111628 = T₄₇₂).

The spelling of 1663109965 in words is "one billion, six hundred sixty-three million, one hundred nine thousand, nine hundred sixty-five".