266064138 has 48 divisors (see below), whose sum is σ = 606056256. Its totient is φ = 84194880.

The previous prime is 266064137. The next prime is 266064143. The reversal of 266064138 is 831460662.

266064138 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 641 + 3 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266064131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54373 + ... + 59063.

It is an arithmetic number, because the mean of its divisors is an integer number (12626172).

Almost surely, 2^266064138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266064138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303028128).

266064138 is an abundant number, since it is smaller than the sum of its proper divisors (339992118).

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

266064138 is a wasteful number, since it uses less digits than its factorization.

266064138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859 (or 4856 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 266064138 is about 16311.4725883349. The cubic root of 266064138 is about 643.1744449684.

The spelling of 266064138 in words is "two hundred sixty-six million, sixty-four thousand, one hundred thirty-eight".