1266864695560 has 256 divisors, whose sum is σ = 3319418880000. Its totient is φ = 431626973184.

The previous prime is 1266864695531. The next prime is 1266864695581. The reversal of 1266864695560 is 655964686621.

It is a junction number, because it is equal to n+sod(n) for n = 1266864695492 and 1266864695501.

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 63 ways as a sum of consecutive naturals, for example, 273087721 + ... + 273092359.

It is an arithmetic number, because the mean of its divisors is an integer number (12966480000).

Almost surely, 2^{1266864695560} is an apocalyptic number.

1266864695560 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 1266864695560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1659709440000).

1266864695560 is an abundant number, since it is smaller than the sum of its proper divisors (2052554184440).

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

1266864695560 is a wasteful number, since it uses less digits than its factorization.

1266864695560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628 (or 5624 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 64.

The spelling of 1266864695560 in words is "one trillion, two hundred sixty-six billion, eight hundred sixty-four million, six hundred ninety-five thousand, five hundred sixty".