266041440 has 144 divisors (see below), whose sum is σ = 1037600928. Its totient is φ = 60807168.

The previous prime is 266041421. The next prime is 266041459. The reversal of 266041440 is 44140662.

266041440 is a `hidden beast` number, since 2 + 6 + 604 + 14 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (266041421) and next prime (266041459).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3117 + ... + 23276.

It is an arithmetic number, because the mean of its divisors is an integer number (7205562).

Almost surely, 2^266041440 is an apocalyptic number.

266041440 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 266041440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (518800464).

266041440 is an abundant number, since it is smaller than the sum of its proper divisors (771559488).

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

266041440 is a wasteful number, since it uses less digits than its factorization.

266041440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26421 (or 26410 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 266041440 is about 16310.7768055357. The cubic root of 266041440 is about 643.1561546559.

It can be divided in two parts, 2660 and 41440, that added together give a square (44100 = 210²).

The spelling of 266041440 in words is "two hundred sixty-six million, forty-one thousand, four hundred forty".