266776727505 has 24 divisors (see below), whose sum is σ = 450490571712. Its totient is φ = 134792449056.

The previous prime is 266776727489. The next prime is 266776727513. The reversal of 266776727505 is 505727677662.

It is a happy number.

It is not a de Polignac number, because 266776727505 - 2⁴ = 266776727489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24627709 + ... + 24638538.

It is an arithmetic number, because the mean of its divisors is an integer number (18770440488).

Almost surely, 2^266776727505 is an apocalyptic number.

It is an amenable number.

266776727505 is a deficient number, since it is larger than the sum of its proper divisors (183713844207).

266776727505 is a wasteful number, since it uses less digits than its factorization.

266776727505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49266293 (or 49266274 counting only the distinct ones).

The product of its (nonzero) digits is 51861600, while the sum is 60.

The spelling of 266776727505 in words is "two hundred sixty-six billion, seven hundred seventy-six million, seven hundred twenty-seven thousand, five hundred five".