4208806661 has 8 divisors (see below), whose sum is σ = 4331902848. Its totient is φ = 4086684000.

The previous prime is 4208806631. The next prime is 4208806663. The reversal of 4208806661 is 1666088024.

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

It is a cyclic number.

It is not a de Polignac number, because 4208806661 - 2⁶ = 4208806597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4208806663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234605 + ... + 251906.

It is an arithmetic number, because the mean of its divisors is an integer number (541487856).

Almost surely, 2^4208806661 is an apocalyptic number.

4208806661 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4208806661 is a deficient number, since it is larger than the sum of its proper divisors (123096187).

4208806661 is a wasteful number, since it uses less digits than its factorization.

4208806661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486763.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 4208806661 is about 64875.3162689786. The cubic root of 4208806661 is about 1614.5555507456. Note that the first 5 decimals are identical.

The spelling of 4208806661 in words is "four billion, two hundred eight million, eight hundred six thousand, six hundred sixty-one".