2013660661 has 8 divisors (see below), whose sum is σ = 2040107544. Its totient is φ = 1987384320.

The previous prime is 2013660653. The next prime is 2013660673. The reversal of 2013660661 is 1660663102.

It can be written as a sum of positive squares in 4 ways, for example, as 1011621636 + 1002039025 = 31806^2 + 31655^2 .

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 2013660661 - 2³ = 2013660653 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 (2013660611) 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, 18780 + ... + 66181.

It is an arithmetic number, because the mean of its divisors is an integer number (255013443).

Almost surely, 2^2013660661 is an apocalyptic number.

It is an amenable number.

2013660661 is a deficient number, since it is larger than the sum of its proper divisors (26446883).

2013660661 is a wasteful number, since it uses less digits than its factorization.

2013660661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85271.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 2013660661 is about 44873.8304694395. The cubic root of 2013660661 is about 1262.7831025550.

The spelling of 2013660661 in words is "two billion, thirteen million, six hundred sixty thousand, six hundred sixty-one".