161355230801 has 4 divisors (see below), whose sum is σ = 164399669172. Its totient is φ = 158310792432.

The previous prime is 161355230779. The next prime is 161355230819. The reversal of 161355230801 is 108032553161.

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 147954853201 + 13400377600 = 384649^2 + 115760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161355230801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161355230821) 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, 1522219106 + ... + 1522219211.

It is an arithmetic number, because the mean of its divisors is an integer number (41099917293).

Almost surely, 2^161355230801 is an apocalyptic number.

It is an amenable number.

161355230801 is a deficient number, since it is larger than the sum of its proper divisors (3044438371).

161355230801 is an equidigital number, since it uses as much as digits as its factorization.

161355230801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044438370.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 161355230801 its reverse (108032553161), we get a palindrome (269387783962).

The spelling of 161355230801 in words is "one hundred sixty-one billion, three hundred fifty-five million, two hundred thirty thousand, eight hundred one".