111111110001000 has 384 divisors, whose sum is σ = 385760497824000. Its totient is φ = 28824733094400.

The previous prime is 111111110000999. The next prime is 111111110001019. The reversal of 111111110001000 is 100011111111.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2863447599 + ... + 2863486401.

It is an arithmetic number, because the mean of its divisors is an integer number (1004584629750).

Almost surely, 2^{111111110001000} is an apocalyptic number.

111111110001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111110001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192880248912000).

111111110001000 is an abundant number, since it is smaller than the sum of its proper divisors (274649387823000).

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

111111110001000 is a wasteful number, since it uses less digits than its factorization.

111111110001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47466 (or 47449 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 111111110001000 its reverse (100011111111), we get a palindrome (111211121112111).

The spelling of 111111110001000 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred ten million, one thousand".