266641440 has 288 divisors, whose sum is σ = 962902080. Its totient is φ = 61820928.

The previous prime is 266641373. The next prime is 266641469. The reversal of 266641440 is 44146662.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1541194 + ... + 1541366.

It is an arithmetic number, because the mean of its divisors is an integer number (3343410).

Almost surely, 2^266641440 is an apocalyptic number.

266641440 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 266641440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481451040).

266641440 is an abundant number, since it is smaller than the sum of its proper divisors (696260640).

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

266641440 is a wasteful number, since it uses less digits than its factorization.

266641440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 266641440 is about 16329.1591945207. The cubic root of 266641440 is about 643.6392923646.

It can be divided in two parts, 26 and 6641440, that added together give a palindrome (6641466).

The spelling of 266641440 in words is "two hundred sixty-six million, six hundred forty-one thousand, four hundred forty".