6661911 has 8 divisors (see below), whose sum is σ = 8903664. Its totient is φ = 4430720.

The previous prime is 6661901. The next prime is 6661933. The reversal of 6661911 is 1191666.

It is a happy number.

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 6661911 - 2⁷ = 6661783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026 + ... + 3791.

It is an arithmetic number, because the mean of its divisors is an integer number (1112958).

Almost surely, 2^6661911 is an apocalyptic number.

6661911 is a deficient number, since it is larger than the sum of its proper divisors (2241753).

6661911 is a wasteful number, since it uses less digits than its factorization.

6661911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281.

The product of its digits is 1944, while the sum is 30.

The square root of 6661911 is about 2581.0678022865. The cubic root of 6661911 is about 188.1624425938.

The spelling of 6661911 in words is "six million, six hundred sixty-one thousand, nine hundred eleven".