266566965 has 16 divisors (see below), whose sum is σ = 487436928. Its totient is φ = 121859136.

The previous prime is 266566957. The next prime is 266566969. The reversal of 266566965 is 569665662.

It is not a de Polignac number, because 266566965 - 2³ = 266566957 is a prime.

It is a super-2 number, since 2×266566965² = 142115893658622450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266566969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1269262 + ... + 1269471.

It is an arithmetic number, because the mean of its divisors is an integer number (30464808).

Almost surely, 2^266566965 is an apocalyptic number.

It is an amenable number.

266566965 is a deficient number, since it is larger than the sum of its proper divisors (220869963).

266566965 is a wasteful number, since it uses less digits than its factorization.

266566965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538748.

The product of its digits is 3499200, while the sum is 51.

The square root of 266566965 is about 16326.8786055388. The cubic root of 266566965 is about 643.5793623204.

The spelling of 266566965 in words is "two hundred sixty-six million, five hundred sixty-six thousand, nine hundred sixty-five".