6661005 has 16 divisors (see below), whose sum is σ = 11477760. Its totient is φ = 3279168.

The previous prime is 6660977. The next prime is 6661013. The reversal of 6661005 is 5001666.

It is not a de Polignac number, because 6661005 - 2¹³ = 6652813 is a prime.

It is a super-2 number, since 2×6661005² = 88737975220050, which contains 22 as substring.

It is a Curzon number.

6661005 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16885 + ... + 17274.

It is an arithmetic number, because the mean of its divisors is an integer number (717360).

Almost surely, 2^6661005 is an apocalyptic number.

6661005 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6661005 is a deficient number, since it is larger than the sum of its proper divisors (4816755).

6661005 is a wasteful number, since it uses less digits than its factorization.

6661005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34180.

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

The square root of 6661005 is about 2580.8922875626. The cubic root of 6661005 is about 188.1539123637.

The spelling of 6661005 in words is "six million, six hundred sixty-one thousand, five".