266578657872 has 20 divisors (see below), whose sum is σ = 688661532960. Its totient is φ = 88859552608.

The previous prime is 266578657861. The next prime is 266578657879. The reversal of 266578657872 is 278756875662.

It is a junction number, because it is equal to n+sod(n) for n = 266578657797 and 266578657806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266578657879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776860972 + ... + 2776861067.

It is an arithmetic number, because the mean of its divisors is an integer number (34433076648).

Almost surely, 2^266578657872 is an apocalyptic number.

It is an amenable number.

266578657872 is an abundant number, since it is smaller than the sum of its proper divisors (422082875088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266578657872 is a wasteful number, since it uses less digits than its factorization.

266578657872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553722050 (or 5553722044 counting only the distinct ones).

The product of its digits is 474163200, while the sum is 69.

The spelling of 266578657872 in words is "two hundred sixty-six billion, five hundred seventy-eight million, six hundred fifty-seven thousand, eight hundred seventy-two".