266661139 has 4 divisors (see below), whose sum is σ = 270641224. Its totient is φ = 262681056.

The previous prime is 266661113. The next prime is 266661173. The reversal of 266661139 is 931166662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 266661139 - 2¹⁷ = 266530067 is a prime.

It is a super-2 number, since 2×266661139² = 142216326105554642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266661539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1989942 + ... + 1990075.

It is an arithmetic number, because the mean of its divisors is an integer number (67660306).

Almost surely, 2^266661139 is an apocalyptic number.

266661139 is a deficient number, since it is larger than the sum of its proper divisors (3980085).

266661139 is an equidigital number, since it uses as much as digits as its factorization.

266661139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3980084.

The product of its digits is 69984, while the sum is 40.

The square root of 266661139 is about 16329.7623681424. The cubic root of 266661139 is about 643.6551422868.

The spelling of 266661139 in words is "two hundred sixty-six million, six hundred sixty-one thousand, one hundred thirty-nine".