266152561 has 4 divisors (see below), whose sum is σ = 281808612. Its totient is φ = 250496512.

The previous prime is 266152547. The next prime is 266152567. The reversal of 266152561 is 165251662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220671025 + 45481536 = 14855^2 + 6744^2 .

It is a cyclic number.

It is not a de Polignac number, because 266152561 - 2⁵ = 266152529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266152567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7828000 + ... + 7828033.

It is an arithmetic number, because the mean of its divisors is an integer number (70452153).

Almost surely, 2^266152561 is an apocalyptic number.

It is an amenable number.

266152561 is a deficient number, since it is larger than the sum of its proper divisors (15656051).

266152561 is a wasteful number, since it uses less digits than its factorization.

266152561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15656050.

The product of its digits is 21600, while the sum is 34.

The square root of 266152561 is about 16314.1828174138. The cubic root of 266152561 is about 643.2456873329.

The spelling of 266152561 in words is "two hundred sixty-six million, one hundred fifty-two thousand, five hundred sixty-one".