11998731156 has 48 divisors (see below), whose sum is σ = 28362136320. Its totient is φ = 3947581440.

The previous prime is 11998731127. The next prime is 11998731161. The reversal of 11998731156 is 65113789911.

11998731156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 11998731099 and 11998731108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606501 + ... + 625971.

It is an arithmetic number, because the mean of its divisors is an integer number (590877840).

Almost surely, 2^11998731156 is an apocalyptic number.

It is an amenable number.

11998731156 is an abundant number, since it is smaller than the sum of its proper divisors (16363405164).

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

11998731156 is a wasteful number, since it uses less digits than its factorization.

11998731156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20144 (or 20142 counting only the distinct ones).

The product of its digits is 408240, while the sum is 51.

The spelling of 11998731156 in words is "eleven billion, nine hundred ninety-eight million, seven hundred thirty-one thousand, one hundred fifty-six".