665279107 has 2 divisors, whose sum is σ = 665279108. Its totient is φ = 665279106.

The previous prime is 665279063. The next prime is 665279171. The reversal of 665279107 is 701972566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665279107 - 2²⁷ = 531061379 is a prime.

It is not a weakly prime, because it can be changed into another prime (665279707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332639553 + 332639554.

It is an arithmetic number, because the mean of its divisors is an integer number (332639554).

Almost surely, 2^665279107 is an apocalyptic number.

665279107 is a deficient number, since it is larger than the sum of its proper divisors (1).

665279107 is an equidigital number, since it uses as much as digits as its factorization.

665279107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 665279107 is about 25793.0050013565. The cubic root of 665279107 is about 872.9739712593.

The spelling of 665279107 in words is "six hundred sixty-five million, two hundred seventy-nine thousand, one hundred seven".