11771511798 has 16 divisors (see below), whose sum is σ = 23566276656. Its totient is φ = 3919961760.

The previous prime is 11771511793. The next prime is 11771511809. The reversal of 11771511798 is 89711517711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11771511793) 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, 962293 + ... + 974448.

It is an arithmetic number, because the mean of its divisors is an integer number (1472892291).

Almost surely, 2^11771511798 is an apocalyptic number.

11771511798 is an abundant number, since it is smaller than the sum of its proper divisors (11794764858).

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

11771511798 is a wasteful number, since it uses less digits than its factorization.

11771511798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937759.

The product of its digits is 123480, while the sum is 48.

The spelling of 11771511798 in words is "eleven billion, seven hundred seventy-one million, five hundred eleven thousand, seven hundred ninety-eight".