266716690505 has 8 divisors (see below), whose sum is σ = 320197230792. Its totient is φ = 213281884288.

The previous prime is 266716690463. The next prime is 266716690517. The reversal of 266716690505 is 505096617662.

It is a happy number.

266716690505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1109422864 + 265607267641 = 33308^2 + 515371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266716690505 - 2⁶ = 266716690441 is a prime.

It is a super-2 number, since 2×266716690505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11420684 + ... + 11444013.

It is an arithmetic number, because the mean of its divisors is an integer number (40024653849).

Almost surely, 2^266716690505 is an apocalyptic number.

It is an amenable number.

266716690505 is a deficient number, since it is larger than the sum of its proper divisors (53480540287).

266716690505 is a wasteful number, since it uses less digits than its factorization.

266716690505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22867035.

The product of its (nonzero) digits is 4082400, while the sum is 53.

It can be divided in two parts, 26671 and 6690505, that added together give a palindrome (6717176).

The spelling of 266716690505 in words is "two hundred sixty-six billion, seven hundred sixteen million, six hundred ninety thousand, five hundred five".