6665777 has 2 divisors, whose sum is σ = 6665778. Its totient is φ = 6665776.

The previous prime is 6665773. The next prime is 6665797. The reversal of 6665777 is 7775666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 1540081 = 2264^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665777 - 2² = 6665773 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6665773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332888 + 3332889.

It is an arithmetic number, because the mean of its divisors is an integer number (3332889).

Almost surely, 2^6665777 is an apocalyptic number.

It is an amenable number.

6665777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665777 is an equidigital number, since it uses as much as digits as its factorization.

6665777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 44.

The square root of 6665777 is about 2581.8166085142. The cubic root of 6665777 is about 188.1988333199.

The spelling of 6665777 in words is "six million, six hundred sixty-five thousand, seven hundred seventy-seven".