1266320563200 has 2970 divisors, whose sum is σ = 6053753633928. Its totient is φ = 260576870400.

The previous prime is 1266320563177. The next prime is 1266320563267. The reversal of 1266320563200 is 23650236621.

1266320563200 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 320 + 5 + 6 + 320 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2970).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 269 ways as a sum of consecutive naturals, for example, 12294374349 + ... + 12294374451.

Almost surely, 2^{1266320563200} is an apocalyptic number.

1266320563200 is a gapful number since it is divisible by the number (10) 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 1266320563200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3026876816964).

1266320563200 is an abundant number, since it is smaller than the sum of its proper divisors (4787433070728).

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

1266320563200 is a wasteful number, since it uses less digits than its factorization.

1266320563200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 1266320563200 its reverse (23650236621), we get a palindrome (1289970799821).

The spelling of 1266320563200 in words is "one trillion, two hundred sixty-six billion, three hundred twenty million, five hundred sixty-three thousand, two hundred".