5001660661 has 16 divisors (see below), whose sum is σ = 5529748608. Its totient is φ = 4499827200.

The previous prime is 5001660649. The next prime is 5001660667. The reversal of 5001660661 is 1660661005.

It is a cyclic number.

It is not a de Polignac number, because 5001660661 - 2²⁵ = 4968106229 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 (5001660667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 783121 + ... + 789481.

It is an arithmetic number, because the mean of its divisors is an integer number (345609288).

Almost surely, 2^5001660661 is an apocalyptic number.

It is an amenable number.

5001660661 is a deficient number, since it is larger than the sum of its proper divisors (528087947).

5001660661 is a wasteful number, since it uses less digits than its factorization.

5001660661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 5001660661 is about 70722.4197903324. The cubic root of 5001660661 is about 1710.1652384127.

The spelling of 5001660661 in words is "five billion, one million, six hundred sixty thousand, six hundred sixty-one".