1665237168 has 360 divisors, whose sum is σ = 5857053696. Its totient is φ = 439084800.

The previous prime is 1665237151. The next prime is 1665237169. The reversal of 1665237168 is 8617325661.

1665237168 is a `hidden beast` number, since 1 + 66 + 523 + 7 + 1 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (1665237169) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5030763 + ... + 5031093.

Almost surely, 2^1665237168 is an apocalyptic number.

1665237168 is a gapful number since it is divisible by the number (18) 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 1665237168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2928526848).

1665237168 is an abundant number, since it is smaller than the sum of its proper divisors (4191816528).

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

1665237168 is a wasteful number, since it uses less digits than its factorization.

1665237168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 397 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1665237168 is about 40807.3175790813. The cubic root of 1665237168 is about 1185.2920329228.

The spelling of 1665237168 in words is "one billion, six hundred sixty-five million, two hundred thirty-seven thousand, one hundred sixty-eight".