266699641 has 4 divisors (see below), whose sum is σ = 287215012. Its totient is φ = 246184272.

The previous prime is 266699639. The next prime is 266699677. The reversal of 266699641 is 146996662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16933225 + 249766416 = 4115^2 + 15804^2 .

It is a cyclic number.

It is not a de Polignac number, because 266699641 - 2¹ = 266699639 is a prime.

It is a super-2 number, since 2×266699641² = 142257397019057762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266699141) 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, 10257666 + ... + 10257691.

It is an arithmetic number, because the mean of its divisors is an integer number (71803753).

Almost surely, 2^266699641 is an apocalyptic number.

It is an amenable number.

266699641 is a deficient number, since it is larger than the sum of its proper divisors (20515371).

266699641 is a wasteful number, since it uses less digits than its factorization.

266699641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20515370.

The product of its digits is 839808, while the sum is 49.

The square root of 266699641 is about 16330.9412159863. The cubic root of 266699641 is about 643.6861189510.

The spelling of 266699641 in words is "two hundred sixty-six million, six hundred ninety-nine thousand, six hundred forty-one".