266009121965 has 16 divisors (see below), whose sum is σ = 327076626240. Its totient is φ = 207566052480.

The previous prime is 266009121943. The next prime is 266009121967. The reversal of 266009121965 is 569121900662.

It is not a de Polignac number, because 266009121965 - 2⁶ = 266009121901 is a prime.

It is a super-2 number, since 2×266009121965² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266009121967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 691742 + ... + 1005248.

It is an arithmetic number, because the mean of its divisors is an integer number (20442289140).

Almost surely, 2^266009121965 is an apocalyptic number.

It is an amenable number.

266009121965 is a deficient number, since it is larger than the sum of its proper divisors (61067504275).

266009121965 is a wasteful number, since it uses less digits than its factorization.

266009121965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317692.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 266009121965 in words is "two hundred sixty-six billion, nine million, one hundred twenty-one thousand, nine hundred sixty-five".