161112880447265 has 4 divisors (see below), whose sum is σ = 193335456536724. Its totient is φ = 128890304357808.

The previous prime is 161112880447261. The next prime is 161112880447303. The reversal of 161112880447265 is 562744088211161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74808799027264 + 86304081420001 = 8649208^2 + 9289999^2 .

It is a cyclic number.

It is not a de Polignac number, because 161112880447265 - 2² = 161112880447261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161112880447265.

It is not an unprimeable number, because it can be changed into a prime (161112880447261) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16111288044722 + ... + 16111288044731.

It is an arithmetic number, because the mean of its divisors is an integer number (48333864134181).

Almost surely, 2^{161112880447265} is an apocalyptic number.

It is an amenable number.

161112880447265 is a deficient number, since it is larger than the sum of its proper divisors (32222576089459).

161112880447265 is an equidigital number, since it uses as much as digits as its factorization.

161112880447265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32222576089458.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The spelling of 161112880447265 in words is "one hundred sixty-one trillion, one hundred twelve billion, eight hundred eighty million, four hundred forty-seven thousand, two hundred sixty-five".