11810981994 has 64 divisors (see below), whose sum is σ = 27125010432. Its totient is φ = 3358555200.

The previous prime is 11810981977. The next prime is 11810982013. The reversal of 11810981994 is 49918901811.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12964399 + ... + 12965309.

It is an arithmetic number, because the mean of its divisors is an integer number (423828288).

Almost surely, 2^11810981994 is an apocalyptic number.

11810981994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

11810981994 is an abundant number, since it is smaller than the sum of its proper divisors (15314028438).

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

11810981994 is a wasteful number, since it uses less digits than its factorization.

11810981994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 186624, while the sum is 51.

The spelling of 11810981994 in words is "eleven billion, eight hundred ten million, nine hundred eighty-one thousand, nine hundred ninety-four".