266343001456561 has 4 divisors (see below), whose sum is σ = 266441174331172. Its totient is φ = 266244828581952.

The previous prime is 266343001456559. The next prime is 266343001456639. The reversal of 266343001456561 is 165654100343662.

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 162706122208161 + 103636879248400 = 12755631^2 + 10180220^2 .

It is a cyclic number.

It is not a de Polignac number, because 266343001456561 - 2¹ = 266343001456559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266343001456499 and 266343001456508.

It is not an unprimeable number, because it can be changed into a prime (266343001456501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49086433236 + ... + 49086438661.

It is an arithmetic number, because the mean of its divisors is an integer number (66610293582793).

Almost surely, 2^{266343001456561} is an apocalyptic number.

It is an amenable number.

266343001456561 is a deficient number, since it is larger than the sum of its proper divisors (98172874611).

266343001456561 is an equidigital number, since it uses as much as digits as its factorization.

266343001456561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98172874610.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 266343001456561 in words is "two hundred sixty-six trillion, three hundred forty-three billion, one million, four hundred fifty-six thousand, five hundred sixty-one".