11491138776 has 192 divisors, whose sum is σ = 32676480000. Its totient is φ = 3361512960.

The previous prime is 11491138759. The next prime is 11491138777. The reversal of 11491138776 is 67783119411.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11491138777) 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 47 ways as a sum of consecutive naturals, for example, 7417650 + ... + 7419198.

It is an arithmetic number, because the mean of its divisors is an integer number (170190000).

Almost surely, 2^11491138776 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 11491138776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16338240000).

11491138776 is an abundant number, since it is smaller than the sum of its proper divisors (21185341224).

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

11491138776 is a wasteful number, since it uses less digits than its factorization.

11491138776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674 (or 1657 counting only the distinct ones).

The product of its digits is 254016, while the sum is 48.

The spelling of 11491138776 in words is "eleven billion, four hundred ninety-one million, one hundred thirty-eight thousand, seven hundred seventy-six".