4000001663 has 6 divisors (see below), whose sum is σ = 4653063216. Its totient is φ = 3428572812.

The previous prime is 4000001609. The next prime is 4000001683. The reversal of 4000001663 is 3661000004.

It is not a de Polignac number, because 4000001663 - 2¹² = 3999997567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000001683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40816295 + ... + 40816392.

It is an arithmetic number, because the mean of its divisors is an integer number (775510536).

Almost surely, 2^4000001663 is an apocalyptic number.

4000001663 is a deficient number, since it is larger than the sum of its proper divisors (653061553).

4000001663 is an equidigital number, since it uses as much as digits as its factorization.

4000001663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81632701 (or 81632694 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 4000001663 is about 63245.5663505356. The cubic root of 4000001663 is about 1587.4012719555.

Adding to 4000001663 its reverse (3661000004), we get a palindrome (7661001667).

The spelling of 4000001663 in words is "four billion, one thousand, six hundred sixty-three".