6661913 has 8 divisors (see below), whose sum is σ = 7036320. Its totient is φ = 6289920.

The previous prime is 6661901. The next prime is 6661933. The reversal of 6661913 is 3191666.

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 6661913 - 2⁶ = 6661849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6661913.

It is not an unprimeable number, because it can be changed into a prime (6661933) 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, 10073 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (879540).

Almost surely, 2^6661913 is an apocalyptic number.

It is an amenable number.

6661913 is a deficient number, since it is larger than the sum of its proper divisors (374407).

6661913 is a wasteful number, since it uses less digits than its factorization.

6661913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207.

The product of its digits is 5832, while the sum is 32.

The square root of 6661913 is about 2581.0681897230. The cubic root of 6661913 is about 188.1624614235.

The spelling of 6661913 in words is "six million, six hundred sixty-one thousand, nine hundred thirteen".