11961867775 has 48 divisors (see below), whose sum is σ = 17796860928. Its totient is φ = 7859376000.

The previous prime is 11961867769. The next prime is 11961867889. The reversal of 11961867775 is 57776816911.

It is a happy number.

It is not a de Polignac number, because 11961867775 - 2³ = 11961867767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132430 + ... + 203620.

It is an arithmetic number, because the mean of its divisors is an integer number (370767936).

Almost surely, 2^11961867775 is an apocalyptic number.

11961867775 is a deficient number, since it is larger than the sum of its proper divisors (5834993153).

11961867775 is a wasteful number, since it uses less digits than its factorization.

11961867775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71272 (or 71267 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 58.

The spelling of 11961867775 in words is "eleven billion, nine hundred sixty-one million, eight hundred sixty-seven thousand, seven hundred seventy-five".