266117729956 has 27 divisors (see below), whose sum is σ = 504310642563. Its totient is φ = 122817377280.

The previous prime is 266117729951. The next prime is 266117729971. The reversal of 266117729956 is 659927711662.

The square root of 266117729956 is 515866.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 208237068900 + 57880661056 = 456330^2 + 240584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 266117729894 and 266117729903.

It is not an unprimeable number, because it can be changed into a prime (266117729951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13402596 + ... + 13422436.

Almost surely, 2^266117729956 is an apocalyptic number.

266117729956 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

266117729956 is the 515866-th square number.

It is an amenable number.

266117729956 is a deficient number, since it is larger than the sum of its proper divisors (238192912607).

266117729956 is an frugal number, since it uses more digits than its factorization.

266117729956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39712 (or 19856 counting only the distinct ones).

The product of its digits is 17146080, while the sum is 61.

The spelling of 266117729956 in words is "two hundred sixty-six billion, one hundred seventeen million, seven hundred twenty-nine thousand, nine hundred fifty-six".