1266869385815 has 16 divisors (see below), whose sum is σ = 1715635032480. Its totient is φ = 889588533120.

The previous prime is 1266869385799. The next prime is 1266869385851. The reversal of 1266869385815 is 5185839686621.

It is a happy number.

It is not a de Polignac number, because 1266869385815 - 2⁴ = 1266869385799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397136144 + ... + 397139333.

It is an arithmetic number, because the mean of its divisors is an integer number (107227189530).

Almost surely, 2^{1266869385815} is an apocalyptic number.

1266869385815 is a deficient number, since it is larger than the sum of its proper divisors (448765646665).

1266869385815 is a wasteful number, since it uses less digits than its factorization.

1266869385815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794275522.

The product of its digits is 149299200, while the sum is 68.

The spelling of 1266869385815 in words is "one trillion, two hundred sixty-six billion, eight hundred sixty-nine million, three hundred eighty-five thousand, eight hundred fifteen".