11806720550 has 12 divisors (see below), whose sum is σ = 21960500316. Its totient is φ = 4722688200.

The previous prime is 11806720531. The next prime is 11806720567. The reversal of 11806720550 is 5502760811.

It is a self number, because there is not a number n which added to its sum of digits gives 11806720550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118067156 + ... + 118067255.

It is an arithmetic number, because the mean of its divisors is an integer number (1830041693).

Almost surely, 2^11806720550 is an apocalyptic number.

11806720550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11806720550 is a deficient number, since it is larger than the sum of its proper divisors (10153779766).

11806720550 is a wasteful number, since it uses less digits than its factorization.

11806720550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236134423 (or 236134418 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 11806720550 in words is "eleven billion, eight hundred six million, seven hundred twenty thousand, five hundred fifty".