165042643016420 has 96 divisors (see below), whose sum is σ = 377441207662176. Its totient is φ = 60256175616000.

The previous prime is 165042643016389. The next prime is 165042643016431. The reversal of 165042643016420 is 24610346240561.

It can be written as a sum of positive squares in 16 ways, for example, as 114855846594724 + 50186796421696 = 10717082^2 + 7084264^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15854462 + ... + 24113258.

It is an arithmetic number, because the mean of its divisors is an integer number (3931679246481).

Almost surely, 2^{165042643016420} is an apocalyptic number.

165042643016420 is a gapful number since it is divisible by the number (10) 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 165042643016420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188720603831088).

165042643016420 is an abundant number, since it is smaller than the sum of its proper divisors (212398564645756).

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

165042643016420 is a wasteful number, since it uses less digits than its factorization.

165042643016420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8259681 (or 8259679 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

Adding to 165042643016420 its reverse (24610346240561), we get a palindrome (189652989256981).

The spelling of 165042643016420 in words is "one hundred sixty-five trillion, forty-two billion, six hundred forty-three million, sixteen thousand, four hundred twenty".