1663685075 has 24 divisors (see below), whose sum is σ = 2226295008. Its totient is φ = 1226004480.

The previous prime is 1663684987. The next prime is 1663685077. The reversal of 1663685075 is 5705863661.

It is not a de Polignac number, because 1663685075 - 2³⁰ = 589943251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663685077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158387 + ... + 168563.

It is an arithmetic number, because the mean of its divisors is an integer number (92762292).

Almost surely, 2^1663685075 is an apocalyptic number.

1663685075 is a deficient number, since it is larger than the sum of its proper divisors (562609933).

1663685075 is a wasteful number, since it uses less digits than its factorization.

1663685075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10703 (or 10698 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 1663685075 is about 40788.2958089695. The cubic root of 1663685075 is about 1184.9236659096.

The spelling of 1663685075 in words is "one billion, six hundred sixty-three million, six hundred eighty-five thousand, seventy-five".