266340561 has 8 divisors (see below), whose sum is σ = 366576384. Its totient is φ = 171832560.

The previous prime is 266340559. The next prime is 266340583. The reversal of 266340561 is 165043662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 266340561 - 2¹ = 266340559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266347561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1431846 + ... + 1432031.

It is an arithmetic number, because the mean of its divisors is an integer number (45822048).

Almost surely, 2^266340561 is an apocalyptic number.

It is an amenable number.

266340561 is a deficient number, since it is larger than the sum of its proper divisors (100235823).

266340561 is a wasteful number, since it uses less digits than its factorization.

266340561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863911.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 266340561 is about 16319.9436579910. The cubic root of 266340561 is about 643.3971064118.

The spelling of 266340561 in words is "two hundred sixty-six million, three hundred forty thousand, five hundred sixty-one".