1311352066556 has 24 divisors (see below), whose sum is σ = 2629446324960. Its totient is φ = 560563273152.

The previous prime is 1311352066537. The next prime is 1311352066559. The reversal of 1311352066556 is 6556602531131.

It is a happy number.

It is a super-2 number, since 2×1311352066556² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311352066559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60187055 + ... + 60208838.

It is an arithmetic number, because the mean of its divisors is an integer number (109560263540).

Almost surely, 2^{1311352066556} is an apocalyptic number.

It is an amenable number.

1311352066556 is an abundant number, since it is smaller than the sum of its proper divisors (1318094258404).

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

1311352066556 is a wasteful number, since it uses less digits than its factorization.

1311352066556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120396293 (or 120396291 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 44.

Adding to 1311352066556 its reverse (6556602531131), we get a palindrome (7867954597687).

The spelling of 1311352066556 in words is "one trillion, three hundred eleven billion, three hundred fifty-two million, sixty-six thousand, five hundred fifty-six".