168512887440 has 120 divisors (see below), whose sum is σ = 590527828800. Its totient is φ = 42982993152.

The previous prime is 168512887399. The next prime is 168512887469. The reversal of 168512887440 is 44788215861.

168512887440 is a `hidden beast` number, since 1 + 6 + 8 + 512 + 8 + 87 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×168512887440² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5071390 + ... + 5104509.

It is an arithmetic number, because the mean of its divisors is an integer number (4921065240).

Almost surely, 2^168512887440 is an apocalyptic number.

168512887440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168512887440 is an abundant number, since it is smaller than the sum of its proper divisors (422014941360).

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

168512887440 is a wasteful number, since it uses less digits than its factorization.

168512887440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10175941 (or 10175932 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The spelling of 168512887440 in words is "one hundred sixty-eight billion, five hundred twelve million, eight hundred eighty-seven thousand, four hundred forty".