266793987780 has 72 divisors (see below), whose sum is σ = 809344536000. Its totient is φ = 71138958912.

The previous prime is 266793987769. The next prime is 266793987787. The reversal of 266793987780 is 87789397662.

266793987780 is a `hidden beast` number, since 26 + 6 + 79 + 398 + 77 + 80 = 666.

266793987780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 266793987699 and 266793987708.

It is not an unprimeable number, because it can be changed into a prime (266793987787) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2279121 + ... + 2393319.

Almost surely, 2^266793987780 is an apocalyptic number.

266793987780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266793987780 is an abundant number, since it is smaller than the sum of its proper divisors (542550548220).

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

266793987780 is a wasteful number, since it uses less digits than its factorization.

266793987780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127193 (or 127188 counting only the distinct ones).

The product of its (nonzero) digits is 384072192, while the sum is 72.

The spelling of 266793987780 in words is "two hundred sixty-six billion, seven hundred ninety-three million, nine hundred eighty-seven thousand, seven hundred eighty".