1266952639680 has 1344 divisors, whose sum is σ = 5630881052160. Its totient is φ = 265802342400.

The previous prime is 1266952639591. The next prime is 1266952639691. The reversal of 1266952639680 is 869362596621.

1266952639680 is a `hidden beast` number, since 1 + 2 + 66 + 95 + 26 + 396 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a Harshad number since it is a multiple of its sum of digits (63).

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 191 ways as a sum of consecutive naturals, for example, 1161275935 + ... + 1161277025.

It is an arithmetic number, because the mean of its divisors is an integer number (4189643640).

Almost surely, 2^{1266952639680} is an apocalyptic number.

1266952639680 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 1266952639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2815440526080).

1266952639680 is an abundant number, since it is smaller than the sum of its proper divisors (4363928412480).

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

1266952639680 is a wasteful number, since it uses less digits than its factorization.

1266952639680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355 (or 1332 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 1266952639680 in words is "one trillion, two hundred sixty-six billion, nine hundred fifty-two million, six hundred thirty-nine thousand, six hundred eighty".