5000006661 has 8 divisors (see below), whose sum is σ = 7179496800. Its totient is φ = 3076927152.

The previous prime is 5000006653. The next prime is 5000006681. The reversal of 5000006661 is 1666000005.

5000006661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 5000006661 - 2³ = 5000006653 is a prime.

It is a super-2 number, since 2×5000006661² = 50000133220088737842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5000006611) 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, 64102611 + ... + 64102688.

It is an arithmetic number, because the mean of its divisors is an integer number (897437100).

Almost surely, 2^5000006661 is an apocalyptic number.

It is an amenable number.

5000006661 is a deficient number, since it is larger than the sum of its proper divisors (2179490139).

5000006661 is a wasteful number, since it uses less digits than its factorization.

5000006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128205315.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 5000006661 is about 70710.7252190218. The cubic root of 5000006661 is about 1709.9767060197.

Adding to 5000006661 its reverse (1666000005), we get a palindrome (6666006666).

The spelling of 5000006661 in words is "five billion, six thousand, six hundred sixty-one".