4021605663 has 16 divisors (see below), whose sum is σ = 5816041056. Its totient is φ = 2461813760.

The previous prime is 4021605661. The next prime is 4021605671. The reversal of 4021605663 is 3665061204.

It is a cyclic number.

It is not a de Polignac number, because 4021605663 - 2¹ = 4021605661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021605661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 959556 + ... + 963737.

It is an arithmetic number, because the mean of its divisors is an integer number (363502566).

Almost surely, 2^4021605663 is an apocalyptic number.

4021605663 is a deficient number, since it is larger than the sum of its proper divisors (1794435393).

4021605663 is a wasteful number, since it uses less digits than its factorization.

4021605663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923354.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 4021605663 is about 63416.1309368523. The cubic root of 4021605663 is about 1590.2539924924.

Adding to 4021605663 its reverse (3665061204), we get a palindrome (7686666867).

The spelling of 4021605663 in words is "four billion, twenty-one million, six hundred five thousand, six hundred sixty-three".