266121128 has 64 divisors (see below), whose sum is σ = 650280960. Its totient is φ = 99081216.

The previous prime is 266121127. The next prime is 266121137. The reversal of 266121128 is 821121662.

It is a super-3 number, since 3×266121128³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266121128.

It is not an unprimeable number, because it can be changed into a prime (266121127) 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, 1625 + ... + 23127.

It is an arithmetic number, because the mean of its divisors is an integer number (10160640).

Almost surely, 2^266121128 is an apocalyptic number.

266121128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266121128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325140480).

266121128 is an abundant number, since it is smaller than the sum of its proper divisors (384159832).

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

266121128 is a wasteful number, since it uses less digits than its factorization.

266121128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21546 (or 21542 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 266121128 is about 16313.2194247488. The cubic root of 266121128 is about 643.2203635893.

The spelling of 266121128 in words is "two hundred sixty-six million, one hundred twenty-one thousand, one hundred twenty-eight".