266139875 has 8 divisors (see below), whose sum is σ = 332142720. Its totient is φ = 212911800.

The previous prime is 266139851. The next prime is 266139883. The reversal of 266139875 is 578931662.

It is not a de Polignac number, because 266139875 - 2¹⁶ = 266074339 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1064435 + ... + 1064684.

It is an arithmetic number, because the mean of its divisors is an integer number (41517840).

Almost surely, 2^266139875 is an apocalyptic number.

266139875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

266139875 is a deficient number, since it is larger than the sum of its proper divisors (66002845).

266139875 is an equidigital number, since it uses as much as digits as its factorization.

266139875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129134 (or 2129124 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The square root of 266139875 is about 16313.7940099782. The cubic root of 266139875 is about 643.2354671990.

The spelling of 266139875 in words is "two hundred sixty-six million, one hundred thirty-nine thousand, eight hundred seventy-five".