1668155112 has 96 divisors (see below), whose sum is σ = 4886973000. Its totient is φ = 511008768.

The previous prime is 1668155089. The next prime is 1668155117. The reversal of 1668155112 is 2115518661.

1668155112 is a `hidden beast` number, since 1 + 66 + 81 + 5 + 511 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 435723876 + 1232431236 = 20874^2 + 35106^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1668155117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214264 + ... + 221912.

Almost surely, 2^1668155112 is an apocalyptic number.

1668155112 is a gapful number since it is divisible by the number (12) 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 1668155112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2443486500).

1668155112 is an abundant number, since it is smaller than the sum of its proper divisors (3218817888).

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

1668155112 is a wasteful number, since it uses less digits than its factorization.

1668155112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7907 (or 7900 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 1668155112 is about 40843.0546360088. The cubic root of 1668155112 is about 1185.9839458956.

The spelling of 1668155112 in words is "one billion, six hundred sixty-eight million, one hundred fifty-five thousand, one hundred twelve".