11841991780 has 24 divisors (see below), whose sum is σ = 24878649600. Its totient is φ = 4734803040.

The previous prime is 11841991753. The next prime is 11841991781. The reversal of 11841991780 is 8719914811.

It is not an unprimeable number, because it can be changed into a prime (11841991781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75426 + ... + 171385.

It is an arithmetic number, because the mean of its divisors is an integer number (1036610400).

Almost surely, 2^11841991780 is an apocalyptic number.

11841991780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11841991780 is an abundant number, since it is smaller than the sum of its proper divisors (13036657820).

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

11841991780 is a wasteful number, since it uses less digits than its factorization.

11841991780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249219 (or 249217 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 49.

The spelling of 11841991780 in words is "eleven billion, eight hundred forty-one million, nine hundred ninety-one thousand, seven hundred eighty".