266065558551 has 48 divisors (see below), whose sum is σ = 417141131680. Its totient is φ = 162444061440.

The previous prime is 266065558489. The next prime is 266065558573. The reversal of 266065558551 is 155855560662.

It is a happy number.

266065558551 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 6 + 5 + 5 + 585 + 51 = 666.

It is not a de Polignac number, because 266065558551 - 2²⁷ = 265931340823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266065554551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28309185 + ... + 28318581.

Almost surely, 2^266065558551 is an apocalyptic number.

266065558551 is a deficient number, since it is larger than the sum of its proper divisors (151075573129).

266065558551 is a wasteful number, since it uses less digits than its factorization.

266065558551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11296 (or 11293 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 54.

The spelling of 266065558551 in words is "two hundred sixty-six billion, sixty-five million, five hundred fifty-eight thousand, five hundred fifty-one".