6417661 has 2 divisors, whose sum is σ = 6417662. Its totient is φ = 6417660.

The previous prime is 6417659. The next prime is 6417673. The reversal of 6417661 is 1667146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5405625 + 1012036 = 2325^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 6417661 - 2¹ = 6417659 is a prime.

Together with 6417659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6411661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3208830 + 3208831.

It is an arithmetic number, because the mean of its divisors is an integer number (3208831).

Almost surely, 2^6417661 is an apocalyptic number.

It is an amenable number.

6417661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6417661 is an equidigital number, since it uses as much as digits as its factorization.

6417661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 6417661 is about 2533.3102849829. The cubic root of 6417661 is about 185.8341779518.

The spelling of 6417661 in words is "six million, four hundred seventeen thousand, six hundred sixty-one".