5641666 has 4 divisors (see below), whose sum is σ = 8462502. Its totient is φ = 2820832.

The previous prime is 5641661. The next prime is 5641679. The reversal of 5641666 is 6661465.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3316041 + 2325625 = 1821^2 + 1525^2 .

It is not an unprimeable number, because it can be changed into a prime (5641661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410415 + ... + 1410418.

Almost surely, 2^5641666 is an apocalyptic number.

5641666 is a deficient number, since it is larger than the sum of its proper divisors (2820836).

5641666 is a wasteful number, since it uses less digits than its factorization.

5641666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820835.

The product of its digits is 25920, while the sum is 34.

The square root of 5641666 is about 2375.2191477841. The cubic root of 5641666 is about 178.0201340689.

The spelling of 5641666 in words is "five million, six hundred forty-one thousand, six hundred sixty-six".