266321645 has 16 divisors (see below), whose sum is σ = 331216560. Its totient is φ = 205330944.

The previous prime is 266321611. The next prime is 266321659. The reversal of 266321645 is 546123662.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 92582884 + 173738761 = 9622^2 + 13181^2 .

It is a cyclic number.

It is not a de Polignac number, because 266321645 - 2⁸ = 266321389 is a prime.

It is a super-3 number, since 3×266321645³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96809 + ... + 99521.

It is an arithmetic number, because the mean of its divisors is an integer number (20701035).

Almost surely, 2^266321645 is an apocalyptic number.

It is an amenable number.

266321645 is a deficient number, since it is larger than the sum of its proper divisors (64894915).

266321645 is a wasteful number, since it uses less digits than its factorization.

266321645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424.

The product of its digits is 51840, while the sum is 35.

The square root of 266321645 is about 16319.3641113862. The cubic root of 266321645 is about 643.3818742998.

The spelling of 266321645 in words is "two hundred sixty-six million, three hundred twenty-one thousand, six hundred forty-five".