1311443303665 has 64 divisors (see below), whose sum is σ = 1899091422720. Its totient is φ = 858135040000.

The previous prime is 1311443303659. The next prime is 1311443303671. The reversal of 1311443303665 is 5663033441131.

It is an interprime number because it is at equal distance from previous prime (1311443303659) and next prime (1311443303671).

It is not a de Polignac number, because 1311443303665 - 2³ = 1311443303657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2499180 + ... + 2978050.

It is an arithmetic number, because the mean of its divisors is an integer number (29673303480).

Almost surely, 2^{1311443303665} is an apocalyptic number.

It is an amenable number.

1311443303665 is a deficient number, since it is larger than the sum of its proper divisors (587648119055).

1311443303665 is a wasteful number, since it uses less digits than its factorization.

1311443303665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479034.

The product of its (nonzero) digits is 233280, while the sum is 40.

Adding to 1311443303665 its reverse (5663033441131), we get a palindrome (6974476744796).

The spelling of 1311443303665 in words is "one trillion, three hundred eleven billion, four hundred forty-three million, three hundred three thousand, six hundred sixty-five".