6661145 has 8 divisors (see below), whose sum is σ = 8341056. Its totient is φ = 5097136.

The previous prime is 6661141. The next prime is 6661157. The reversal of 6661145 is 5411666.

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 6661145 - 2² = 6661141 is a prime.

It is a super-2 number, since 2×6661145² = 88741705422050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661141) 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, 28847 + ... + 29076.

It is an arithmetic number, because the mean of its divisors is an integer number (1042632).

Almost surely, 2^6661145 is an apocalyptic number.

It is an amenable number.

6661145 is a deficient number, since it is larger than the sum of its proper divisors (1679911).

6661145 is a wasteful number, since it uses less digits than its factorization.

6661145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57951.

The product of its digits is 4320, while the sum is 29.

The square root of 6661145 is about 2580.9194098228. The cubic root of 6661145 is about 188.1552305513.

The spelling of 6661145 in words is "six million, six hundred sixty-one thousand, one hundred forty-five".