266161272 has 128 divisors (see below), whose sum is σ = 768096000. Its totient is φ = 76170240.

The previous prime is 266161219. The next prime is 266161277. The reversal of 266161272 is 272161662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266161277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 349372 + ... + 350132.

It is an arithmetic number, because the mean of its divisors is an integer number (6000750).

Almost surely, 2^266161272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266161272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384048000).

266161272 is an abundant number, since it is smaller than the sum of its proper divisors (501934728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266161272 is a wasteful number, since it uses less digits than its factorization.

266161272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 857 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 266161272 is about 16314.4497915192. The cubic root of 266161272 is about 643.2527049272.

The spelling of 266161272 in words is "two hundred sixty-six million, one hundred sixty-one thousand, two hundred seventy-two".