266864785720 has 32 divisors (see below), whose sum is σ = 646633905120. Its totient is φ = 98534689920.

The previous prime is 266864785717. The next prime is 266864785729. The reversal of 266864785720 is 27587468662.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266864785729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256600236 + ... + 256601275.

It is an arithmetic number, because the mean of its divisors is an integer number (20207309535).

Almost surely, 2^266864785720 is an apocalyptic number.

266864785720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266864785720 is an abundant number, since it is smaller than the sum of its proper divisors (379769119400).

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

266864785720 is a wasteful number, since it uses less digits than its factorization.

266864785720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513201535 (or 513201531 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 61.

The spelling of 266864785720 in words is "two hundred sixty-six billion, eight hundred sixty-four million, seven hundred eighty-five thousand, seven hundred twenty".