1311640855881 has 16 divisors (see below), whose sum is σ = 1839330823680. Its totient is φ = 830253490560.

The previous prime is 1311640855849. The next prime is 1311640855901. The reversal of 1311640855881 is 1885580461131.

It is not a de Polignac number, because 1311640855881 - 2⁵ = 1311640855849 is a prime.

It is a super-2 number, since 2×1311640855881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1311640855081) 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 15 ways as a sum of consecutive naturals, for example, 133048516 + ... + 133058373.

It is an arithmetic number, because the mean of its divisors is an integer number (114958176480).

Almost surely, 2^{1311640855881} is an apocalyptic number.

It is an amenable number.

1311640855881 is a deficient number, since it is larger than the sum of its proper divisors (527689967799).

1311640855881 is a wasteful number, since it uses less digits than its factorization.

1311640855881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266106976.

The product of its (nonzero) digits is 921600, while the sum is 51.

The spelling of 1311640855881 in words is "one trillion, three hundred eleven billion, six hundred forty million, eight hundred fifty-five thousand, eight hundred eighty-one".