11911770820 has 24 divisors (see below), whose sum is σ = 25367041728. Its totient is φ = 4697599200.

The previous prime is 11911770803. The next prime is 11911770821. The reversal of 11911770820 is 2807711911.

It is a self number, because there is not a number n which added to its sum of digits gives 11911770820.

It is not an unprimeable number, because it can be changed into a prime (11911770821) 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 7 ways as a sum of consecutive naturals, for example, 4192866 + ... + 4195705.

It is an arithmetic number, because the mean of its divisors is an integer number (1056960072).

Almost surely, 2^11911770820 is an apocalyptic number.

11911770820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11911770820 is an abundant number, since it is smaller than the sum of its proper divisors (13455270908).

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

11911770820 is a wasteful number, since it uses less digits than its factorization.

11911770820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8388651 (or 8388649 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 37.

The spelling of 11911770820 in words is "eleven billion, nine hundred eleven million, seven hundred seventy thousand, eight hundred twenty".