266115240 has 64 divisors (see below), whose sum is σ = 887054400. Its totient is φ = 70963776.

The previous prime is 266115233. The next prime is 266115247. The reversal of 266115240 is 42511662.

266115240 is a `hidden beast` number, since 2 + 6 + 611 + 5 + 2 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (266115233) and next prime (266115247).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (266115247) 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, 122122 + ... + 124281.

It is an arithmetic number, because the mean of its divisors is an integer number (13860225).

Almost surely, 2^266115240 is an apocalyptic number.

266115240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266115240 is an abundant number, since it is smaller than the sum of its proper divisors (620939160).

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

266115240 is a wasteful number, since it uses less digits than its factorization.

266115240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246423 (or 246413 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 266115240 is about 16313.0389566138. The cubic root of 266115240 is about 643.2156197477.

The spelling of 266115240 in words is "two hundred sixty-six million, one hundred fifteen thousand, two hundred forty".