11998779798 has 32 divisors (see below), whose sum is σ = 24159073536. Its totient is φ = 3972703968.

The previous prime is 11998779769. The next prime is 11998779833. The reversal of 11998779798 is 89797789911.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2615815 + ... + 2620397.

It is an arithmetic number, because the mean of its divisors is an integer number (754971048).

Almost surely, 2^11998779798 is an apocalyptic number.

11998779798 is an abundant number, since it is smaller than the sum of its proper divisors (12160293738).

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

11998779798 is a wasteful number, since it uses less digits than its factorization.

11998779798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7428.

The product of its digits is 144027072, while the sum is 75.

The spelling of 11998779798 in words is "eleven billion, nine hundred ninety-eight million, seven hundred seventy-nine thousand, seven hundred ninety-eight".