266697749 has 4 divisors (see below), whose sum is σ = 271729836. Its totient is φ = 261665664.

The previous prime is 266697733. The next prime is 266697803. The reversal of 266697749 is 947796662.

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 207561649 + 59136100 = 14407^2 + 7690^2 .

It is not a de Polignac number, because 266697749 - 2⁴ = 266697733 is a prime.

It is a super-2 number, since 2×266697749² = 142255378643334002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266697694 and 266697703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266697149) 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, 2515964 + ... + 2516069.

It is an arithmetic number, because the mean of its divisors is an integer number (67932459).

Almost surely, 2^266697749 is an apocalyptic number.

It is an amenable number.

266697749 is a deficient number, since it is larger than the sum of its proper divisors (5032087).

266697749 is an equidigital number, since it uses as much as digits as its factorization.

266697749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5032086.

The product of its digits is 6858432, while the sum is 56.

The square root of 266697749 is about 16330.8832890325. The cubic root of 266697749 is about 643.6845968179.

The spelling of 266697749 in words is "two hundred sixty-six million, six hundred ninety-seven thousand, seven hundred forty-nine".