1663100665 has 8 divisors (see below), whose sum is σ = 2013382728. Its totient is φ = 1318705920.

The previous prime is 1663100657. The next prime is 1663100683. The reversal of 1663100665 is 5660013661.

It can be written as a sum of positive squares in 4 ways, for example, as 6285049 + 1656815616 = 2507^2 + 40704^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1663100665 - 2³ = 1663100657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663100665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1471206 + ... + 1472335.

It is an arithmetic number, because the mean of its divisors is an integer number (251672841).

Almost surely, 2^1663100665 is an apocalyptic number.

It is an amenable number.

1663100665 is a deficient number, since it is larger than the sum of its proper divisors (350282063).

1663100665 is a wasteful number, since it uses less digits than its factorization.

1663100665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943659.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 1663100665 is about 40781.1312373750. The cubic root of 1663100665 is about 1184.7849052052.

The spelling of 1663100665 in words is "one billion, six hundred sixty-three million, one hundred thousand, six hundred sixty-five".