266065920 has 144 divisors (see below), whose sum is σ = 922456080. Its totient is φ = 70926336.

The previous prime is 266065871. The next prime is 266065967. The reversal of 266065920 is 29560662.

266065920 is a `hidden beast` number, since 2 + 6 + 60 + 6 + 592 + 0 = 666.

266065920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90717 + ... + 93603.

It is an arithmetic number, because the mean of its divisors is an integer number (6405945).

Almost surely, 2^266065920 is an apocalyptic number.

266065920 is a gapful number since it is divisible by the number (20) 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 266065920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461228040).

266065920 is an abundant number, since it is smaller than the sum of its proper divisors (656390160).

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

266065920 is a wasteful number, since it uses less digits than its factorization.

266065920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 266065920 is about 16311.5272123735. The cubic root of 266065920 is about 643.1758808807.

The spelling of 266065920 in words is "two hundred sixty-six million, sixty-five thousand, nine hundred twenty".