161427165641 has 4 divisors (see below), whose sum is σ = 184488189312. Its totient is φ = 138366141972.

The previous prime is 161427165607. The next prime is 161427165667. The reversal of 161427165641 is 146561724161.

161427165641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146561724161 = 3259 ⋅44971379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161427165641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161427165592 and 161427165601.

It is not an unprimeable number, because it can be changed into a prime (161427165671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11530511825 + ... + 11530511838.

It is an arithmetic number, because the mean of its divisors is an integer number (46122047328).

Almost surely, 2^161427165641 is an apocalyptic number.

It is an amenable number.

161427165641 is a deficient number, since it is larger than the sum of its proper divisors (23061023671).

161427165641 is an equidigital number, since it uses as much as digits as its factorization.

161427165641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23061023670.

The product of its digits is 241920, while the sum is 44.

The spelling of 161427165641 in words is "one hundred sixty-one billion, four hundred twenty-seven million, one hundred sixty-five thousand, six hundred forty-one".