6665801 has 2 divisors, whose sum is σ = 6665802. Its totient is φ = 6665800.

The previous prime is 6665797. The next prime is 6665803. The reversal of 6665801 is 1085666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4182025 + 2483776 = 2045^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665801 - 2² = 6665797 is a prime.

Together with 6665803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6665803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332900 + 3332901.

It is an arithmetic number, because the mean of its divisors is an integer number (3332901).

Almost surely, 2^6665801 is an apocalyptic number.

It is an amenable number.

6665801 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665801 is an equidigital number, since it uses as much as digits as its factorization.

6665801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6665801 is about 2581.8212564002. The cubic root of 6665801 is about 188.1990591884.

The spelling of 6665801 in words is "six million, six hundred sixty-five thousand, eight hundred one".