1311252165564 has 96 divisors (see below), whose sum is σ = 3462448550400. Its totient is φ = 382578389760.

The previous prime is 1311252165499. The next prime is 1311252165581. The reversal of 1311252165564 is 4655612521131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 897174 + ... + 1851330.

It is an arithmetic number, because the mean of its divisors is an integer number (36067172400).

Almost surely, 2^{1311252165564} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311252165564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731224275200).

1311252165564 is an abundant number, since it is smaller than the sum of its proper divisors (2151196384836).

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

1311252165564 is a wasteful number, since it uses less digits than its factorization.

1311252165564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954563 (or 954561 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

Adding to 1311252165564 its reverse (4655612521131), we get a palindrome (5966864686695).

The spelling of 1311252165564 in words is "one trillion, three hundred eleven billion, two hundred fifty-two million, one hundred sixty-five thousand, five hundred sixty-four".