266206121161 has 16 divisors (see below), whose sum is σ = 281238335488. Its totient is φ = 251579034000.

The previous prime is 266206121113. The next prime is 266206121171. The reversal of 266206121161 is 161121602662.

It is a cyclic number.

It is not a de Polignac number, because 266206121161 - 2³⁷ = 128767167689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266206121171) 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 15 ways as a sum of consecutive naturals, for example, 8183050 + ... + 8215516.

It is an arithmetic number, because the mean of its divisors is an integer number (17577395968).

Almost surely, 2^266206121161 is an apocalyptic number.

It is an amenable number.

266206121161 is a deficient number, since it is larger than the sum of its proper divisors (15032214327).

266206121161 is a wasteful number, since it uses less digits than its factorization.

266206121161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38692.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 266206121161 in words is "two hundred sixty-six billion, two hundred six million, one hundred twenty-one thousand, one hundred sixty-one".