1840111817172 has 12 divisors (see below), whose sum is σ = 4293594240096. Its totient is φ = 613370605720.

The previous prime is 1840111817171. The next prime is 1840111817179. The reversal of 1840111817172 is 2717181110481.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1840111817172² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840111817171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76671325704 + ... + 76671325727.

It is an arithmetic number, because the mean of its divisors is an integer number (357799520008).

Almost surely, 2^{1840111817172} is an apocalyptic number.

1840111817172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1840111817172 is an abundant number, since it is smaller than the sum of its proper divisors (2453482422924).

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

1840111817172 is a wasteful number, since it uses less digits than its factorization.

1840111817172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153342651438 (or 153342651436 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 42.

The spelling of 1840111817172 in words is "one trillion, eight hundred forty billion, one hundred eleven million, eight hundred seventeen thousand, one hundred seventy-two".