1101111156172 has 12 divisors (see below), whose sum is σ = 1926963985576. Its totient is φ = 550550017440.

The previous prime is 1101111156169. The next prime is 1101111156209. The reversal of 1101111156172 is 2716511111011.

It is a self number, because there is not a number n which added to its sum of digits gives 1101111156172.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 927513 + ... + 1750000.

Almost surely, 2^{1101111156172} is an apocalyptic number.

It is an amenable number.

1101111156172 is a deficient number, since it is larger than the sum of its proper divisors (825852829404).

1101111156172 is a wasteful number, since it uses less digits than its factorization.

1101111156172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780328 (or 2780326 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 28.

Adding to 1101111156172 its reverse (2716511111011), we get a palindrome (3817622267183).

The spelling of 1101111156172 in words is "one trillion, one hundred one billion, one hundred eleven million, one hundred fifty-six thousand, one hundred seventy-two".