1266842642855 has 16 divisors (see below), whose sum is σ = 1569353449728. Its totient is φ = 980716896000.

The previous prime is 1266842642851. The next prime is 1266842642869. The reversal of 1266842642855 is 5582462486621.

It is a happy number.

It is not a de Polignac number, because 1266842642855 - 2² = 1266842642851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1266842642794 and 1266842642803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266842642851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166515 + ... + 2688395.

It is an arithmetic number, because the mean of its divisors is an integer number (98084590608).

Almost surely, 2^{1266842642855} is an apocalyptic number.

1266842642855 is a deficient number, since it is larger than the sum of its proper divisors (302510806873).

1266842642855 is a wasteful number, since it uses less digits than its factorization.

1266842642855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537578.

The product of its digits is 44236800, while the sum is 59.

The spelling of 1266842642855 in words is "one trillion, two hundred sixty-six billion, eight hundred forty-two million, six hundred forty-two thousand, eight hundred fifty-five".