666258065 has 12 divisors (see below), whose sum is σ = 878800692. Its totient is φ = 484550880.

The previous prime is 666258059. The next prime is 666258097. The reversal of 666258065 is 560852666.

It is a happy number.

666258065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 189971089 + 476286976 = 13783^2 + 21824^2 .

It is not a de Polignac number, because 666258065 - 2⁴ = 666258049 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550022 + ... + 551231.

It is an arithmetic number, because the mean of its divisors is an integer number (73233391).

Almost surely, 2^666258065 is an apocalyptic number.

It is an amenable number.

666258065 is a deficient number, since it is larger than the sum of its proper divisors (212542627).

666258065 is a wasteful number, since it uses less digits than its factorization.

666258065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101280 (or 1101269 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 666258065 is about 25811.9752246898. The cubic root of 666258065 is about 873.4019550447.

The spelling of 666258065 in words is "six hundred sixty-six million, two hundred fifty-eight thousand, sixty-five".