1581096168 has 72 divisors (see below), whose sum is σ = 4375623330. Its totient is φ = 515766720.

The previous prime is 1581096151. The next prime is 1581096239. The reversal of 1581096168 is 8616901851.

1581096168 is a `hidden beast` number, since 1 + 581 + 0 + 9 + 6 + 1 + 68 = 666.

It is a Cunningham number, because it is equal to 39763²-1.

It can be written as a sum of positive squares in only one way, i.e., 1581016644 + 79524 = 39762^2 + 282^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 154078 + ... + 164018.

Almost surely, 2^1581096168 is an apocalyptic number.

1581096168 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 1581096168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2187811665).

1581096168 is an abundant number, since it is smaller than the sum of its proper divisors (2794527162).

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

1581096168 is a wasteful number, since it uses less digits than its factorization.

1581096168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10047 (or 9993 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1581096168 is about 39762.9999874255. Note that the first 4 decimals coincide. The cubic root of 1581096168 is about 1164.9825727590.

The spelling of 1581096168 in words is "one billion, five hundred eighty-one million, ninety-six thousand, one hundred sixty-eight".