1266416805138 has 16 divisors (see below), whose sum is σ = 2533018262880. Its totient is φ = 422108159616.

The previous prime is 1266416805131. The next prime is 1266416805161. The reversal of 1266416805138 is 8315086146621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1266416805131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7604620 + ... + 7769367.

It is an arithmetic number, because the mean of its divisors is an integer number (158313641430).

Almost surely, 2^{1266416805138} is an apocalyptic number.

1266416805138 is an abundant number, since it is smaller than the sum of its proper divisors (1266601457742).

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

1266416805138 is a wasteful number, since it uses less digits than its factorization.

1266416805138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15387721.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The spelling of 1266416805138 in words is "one trillion, two hundred sixty-six billion, four hundred sixteen million, eight hundred five thousand, one hundred thirty-eight".