665255089 has 2 divisors, whose sum is σ = 665255090. Its totient is φ = 665255088.

The previous prime is 665255057. The next prime is 665255119. The reversal of 665255089 is 980552566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 417507489 + 247747600 = 20433^2 + 15740^2 .

It is a cyclic number.

It is not a de Polignac number, because 665255089 - 2⁵ = 665255057 is a prime.

It is not a weakly prime, because it can be changed into another prime (665255029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332627544 + 332627545.

It is an arithmetic number, because the mean of its divisors is an integer number (332627545).

Almost surely, 2^665255089 is an apocalyptic number.

It is an amenable number.

665255089 is a deficient number, since it is larger than the sum of its proper divisors (1).

665255089 is an equidigital number, since it uses as much as digits as its factorization.

665255089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 665255089 is about 25792.5394058049. The cubic root of 665255089 is about 872.9634657231.

The spelling of 665255089 in words is "six hundred sixty-five million, two hundred fifty-five thousand, eighty-nine".