6645917 has 2 divisors, whose sum is σ = 6645918. Its totient is φ = 6645916.

The previous prime is 6645911. The next prime is 6645923. The reversal of 6645917 is 7195466.

It is a balanced prime because it is at equal distance from previous prime (6645911) and next prime (6645923).

It can be written as a sum of positive squares in only one way, i.e., 5541316 + 1104601 = 2354^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 6645917 - 2¹² = 6641821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322958 + 3322959.

It is an arithmetic number, because the mean of its divisors is an integer number (3322959).

Almost surely, 2^6645917 is an apocalyptic number.

It is an amenable number.

6645917 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645917 is an equidigital number, since it uses as much as digits as its factorization.

6645917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 6645917 is about 2577.9676103473. The cubic root of 6645917 is about 188.0117410051.

The spelling of 6645917 in words is "six million, six hundred forty-five thousand, nine hundred seventeen".