1155251123312 has 80 divisors (see below), whose sum is σ = 2630488408800. Its totient is φ = 484558848000.

The previous prime is 1155251123311. The next prime is 1155251123381. The reversal of 1155251123312 is 2133211525511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155251123311) 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, 6893312 + ... + 7058912.

It is an arithmetic number, because the mean of its divisors is an integer number (32881105110).

Almost surely, 2^{1155251123312} 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 1155251123312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315244204400).

1155251123312 is an abundant number, since it is smaller than the sum of its proper divisors (1475237285488).

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

1155251123312 is a wasteful number, since it uses less digits than its factorization.

1155251123312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168682 (or 168676 counting only the distinct ones).

The product of its digits is 9000, while the sum is 32.

Adding to 1155251123312 its reverse (2133211525511), we get a palindrome (3288462648823).

The spelling of 1155251123312 in words is "one trillion, one hundred fifty-five billion, two hundred fifty-one million, one hundred twenty-three thousand, three hundred twelve".