266555200550661 has 96 divisors (see below), whose sum is σ = 425465244981504. Its totient is φ = 160799408668800.

The previous prime is 266555200550641. The next prime is 266555200550671. The reversal of 266555200550661 is 166055002555662.

266555200550661 is a `hidden beast` number, since 2 + 6 + 6 + 5 + 5 + 5 + 20 + 0 + 550 + 6 + 61 = 666.

It is not a de Polignac number, because 266555200550661 - 2¹⁰ = 266555200549637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 266555200550598 and 266555200550607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266555200550641) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 2881538136 + ... + 2881630638.

It is an arithmetic number, because the mean of its divisors is an integer number (4431929635224).

Almost surely, 2^{266555200550661} is an apocalyptic number.

It is an amenable number.

266555200550661 is a deficient number, since it is larger than the sum of its proper divisors (158910044430843).

266555200550661 is a wasteful number, since it uses less digits than its factorization.

266555200550661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93656 (or 93631 counting only the distinct ones).

The product of its (nonzero) digits is 16200000, while the sum is 54.

The spelling of 266555200550661 in words is "two hundred sixty-six trillion, five hundred fifty-five billion, two hundred million, five hundred fifty thousand, six hundred sixty-one".