266705764260 has 192 divisors, whose sum is σ = 816431320320. Its totient is φ = 64656506880.

The previous prime is 266705764207. The next prime is 266705764267. The reversal of 266705764260 is 62467507662.

It is a happy number.

It is a super-2 number, since 2×266705764260² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266705764267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43783815 + ... + 43789905.

It is an arithmetic number, because the mean of its divisors is an integer number (4252246460).

Almost surely, 2^266705764260 is an apocalyptic number.

266705764260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266705764260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408215660160).

266705764260 is an abundant number, since it is smaller than the sum of its proper divisors (549725556060).

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

266705764260 is a wasteful number, since it uses less digits than its factorization.

266705764260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6958 (or 6956 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 51.

The spelling of 266705764260 in words is "two hundred sixty-six billion, seven hundred five million, seven hundred sixty-four thousand, two hundred sixty".