266899489 has 2 divisors, whose sum is σ = 266899490. Its totient is φ = 266899488.

The previous prime is 266899487. The next prime is 266899543. The reversal of 266899489 is 984998662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174451264 + 92448225 = 13208^2 + 9615^2 .

It is a cyclic number.

It is not a de Polignac number, because 266899489 - 2¹ = 266899487 is a prime.

It is a super-2 number, since 2×266899489² = 142470674456922242, which contains 22 as substring.

Together with 266899487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (266899481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133449744 + 133449745.

It is an arithmetic number, because the mean of its divisors is an integer number (133449745).

Almost surely, 2^266899489 is an apocalyptic number.

It is an amenable number.

266899489 is a deficient number, since it is larger than the sum of its proper divisors (1).

266899489 is an equidigital number, since it uses as much as digits as its factorization.

266899489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 61.

The square root of 266899489 is about 16337.0587622130. The cubic root of 266899489 is about 643.8468581568.

The spelling of 266899489 in words is "two hundred sixty-six million, eight hundred ninety-nine thousand, four hundred eighty-nine".