11961493188 has 12 divisors (see below), whose sum is σ = 27910150800. Its totient is φ = 3987164392.

The previous prime is 11961493147. The next prime is 11961493213. The reversal of 11961493188 is 88139416911.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 11961493188.

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, 498395538 + ... + 498395561.

It is an arithmetic number, because the mean of its divisors is an integer number (2325845900).

Almost surely, 2^11961493188 is an apocalyptic number.

It is an amenable number.

11961493188 is an abundant number, since it is smaller than the sum of its proper divisors (15948657612).

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

11961493188 is a wasteful number, since it uses less digits than its factorization.

11961493188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996791106 (or 996791104 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The spelling of 11961493188 in words is "eleven billion, nine hundred sixty-one million, four hundred ninety-three thousand, one hundred eighty-eight".