3806668221 has 8 divisors (see below), whose sum is σ = 5342692320. Its totient is φ = 2404211472.

The previous prime is 3806668207. The next prime is 3806668253. The reversal of 3806668221 is 1228666083.

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

It is not a de Polignac number, because 3806668221 - 2¹⁴ = 3806651837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3806668721) 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, 33391770 + ... + 33391883.

It is an arithmetic number, because the mean of its divisors is an integer number (667836540).

Almost surely, 2^3806668221 is an apocalyptic number.

It is an amenable number.

3806668221 is a deficient number, since it is larger than the sum of its proper divisors (1536024099).

3806668221 is a wasteful number, since it uses less digits than its factorization.

3806668221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66783675.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 3806668221 is about 61698.2027371949. The cubic root of 3806668221 is about 1561.4029977692.

The spelling of 3806668221 in words is "three billion, eight hundred six million, six hundred sixty-eight thousand, two hundred twenty-one".