266104565506601 has 4 divisors (see below), whose sum is σ = 266106247390932. Its totient is φ = 266102883622272.

The previous prime is 266104565506597. The next prime is 266104565506609. The reversal of 266104565506601 is 106605565401662.

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 150230126785600 + 115874438721001 = 12256840^2 + 10764499^2 .

It is a cyclic number.

It is not a de Polignac number, because 266104565506601 - 2² = 266104565506597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266104565506609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 840704816 + ... + 841021281.

It is an arithmetic number, because the mean of its divisors is an integer number (66526561847733).

Almost surely, 2^{266104565506601} is an apocalyptic number.

It is an amenable number.

266104565506601 is a deficient number, since it is larger than the sum of its proper divisors (1681884331).

266104565506601 is a wasteful number, since it uses less digits than its factorization.

266104565506601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681884330.

The product of its (nonzero) digits is 7776000, while the sum is 53.

The spelling of 266104565506601 in words is "two hundred sixty-six trillion, one hundred four billion, five hundred sixty-five million, five hundred six thousand, six hundred one".