1266665311368 has 36 divisors (see below), whose sum is σ = 3430577749365. Its totient is φ = 422218587168.

The previous prime is 1266665311361. The next prime is 1266665311393. The reversal of 1266665311368 is 8631135666621.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 667747196964 + 598918114404 = 817158^2 + 773898^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=795822.

It is a super-2 number, since 2×1266665311368² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1266665311361) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9483546 + ... + 9616182.

Almost surely, 2^{1266665311368} is an apocalyptic number.

1266665311368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1266665311368 is an abundant number, since it is smaller than the sum of its proper divisors (2163912437997).

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

1266665311368 is an frugal number, since it uses more digits than its factorization.

1266665311368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265286 (or 132642 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The spelling of 1266665311368 in words is "one trillion, two hundred sixty-six billion, six hundred sixty-five million, three hundred eleven thousand, three hundred sixty-eight".