266617989 has 12 divisors (see below), whose sum is σ = 420125472. Its totient is φ = 161586600.

The previous prime is 266617961. The next prime is 266618003. The reversal of 266617989 is 989716662.

It is not a de Polignac number, because 266617989 - 2⁸ = 266617733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266617289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1346457 + ... + 1346654.

It is an arithmetic number, because the mean of its divisors is an integer number (35010456).

Almost surely, 2^266617989 is an apocalyptic number.

It is an amenable number.

266617989 is a deficient number, since it is larger than the sum of its proper divisors (153507483).

266617989 is a wasteful number, since it uses less digits than its factorization.

266617989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693128 (or 2693125 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 266617989 is about 16328.4411074664. The cubic root of 266617989 is about 643.6204225451.

The spelling of 266617989 in words is "two hundred sixty-six million, six hundred seventeen thousand, nine hundred eighty-nine".