4406643661 has 16 divisors (see below), whose sum is σ = 5337377280. Its totient is φ = 3551627520.

The previous prime is 4406643653. The next prime is 4406643691. The reversal of 4406643661 is 1663466044.

It is not a de Polignac number, because 4406643661 - 2³ = 4406643653 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 (4406643601) 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, 115276 + ... + 148666.

It is an arithmetic number, because the mean of its divisors is an integer number (333586080).

Almost surely, 2^4406643661 is an apocalyptic number.

It is an amenable number.

4406643661 is a deficient number, since it is larger than the sum of its proper divisors (930733619).

4406643661 is a wasteful number, since it uses less digits than its factorization.

4406643661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34524.

The product of its (nonzero) digits is 248832, while the sum is 40.

The square root of 4406643661 is about 66382.5553967305. Note that the first 3 decimals coincide. The cubic root of 4406643661 is about 1639.4668677796.

The spelling of 4406643661 in words is "four billion, four hundred six million, six hundred forty-three thousand, six hundred sixty-one".