6411661 has 2 divisors, whose sum is σ = 6411662. Its totient is φ = 6411660.

The previous prime is 6411593. The next prime is 6411673. The reversal of 6411661 is 1661146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6325225 + 86436 = 2515^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 6411661 - 2⁹ = 6411149 is a prime.

It is a super-2 number, since 2×6411661² = 82218793557842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6411961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205830 + 3205831.

It is an arithmetic number, because the mean of its divisors is an integer number (3205831).

Almost surely, 2^6411661 is an apocalyptic number.

It is an amenable number.

6411661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6411661 is an equidigital number, since it uses as much as digits as its factorization.

6411661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 6411661 is about 2532.1257867649. The cubic root of 6411661 is about 185.7762465274.

The spelling of 6411661 in words is "six million, four hundred eleven thousand, six hundred sixty-one".