1266043645120 has 56 divisors (see below), whose sum is σ = 3018260444544. Its totient is φ = 505830537216.

The previous prime is 1266043645039. The next prime is 1266043645127. The reversal of 1266043645120 is 215463406621.

It is a super-2 number, since 2×1266043645120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1266043645127) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2016069 + ... + 2568388.

Almost surely, 2^{1266043645120} is an apocalyptic number.

1266043645120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266043645120 is an abundant number, since it is smaller than the sum of its proper divisors (1752216799424).

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

1266043645120 is an equidigital number, since it uses as much as digits as its factorization.

1266043645120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585337 (or 4585327 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 1266043645120 in words is "one trillion, two hundred sixty-six billion, forty-three million, six hundred forty-five thousand, one hundred twenty".