11551211144 has 16 divisors (see below), whose sum is σ = 23627477520. Its totient is φ = 5250550480.

The previous prime is 11551211123. The next prime is 11551211159. The reversal of 11551211144 is 44111215511.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65631794 + ... + 65631969.

It is an arithmetic number, because the mean of its divisors is an integer number (1476717345).

Almost surely, 2^11551211144 is an apocalyptic number.

It is an amenable number.

11551211144 is an abundant number, since it is smaller than the sum of its proper divisors (12076266376).

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

11551211144 is a wasteful number, since it uses less digits than its factorization.

11551211144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131263780 (or 131263776 counting only the distinct ones).

The product of its digits is 800, while the sum is 26.

Adding to 11551211144 its reverse (44111215511), we get a palindrome (55662426655).

The spelling of 11551211144 in words is "eleven billion, five hundred fifty-one million, two hundred eleven thousand, one hundred forty-four".