161363601145 has 4 divisors (see below), whose sum is σ = 193636321380. Its totient is φ = 129090880912.

The previous prime is 161363601137. The next prime is 161363601211. The reversal of 161363601145 is 541106363161.

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 30739907584 + 130623693561 = 175328^2 + 361419^2 .

It is a cyclic number.

It is not a de Polignac number, because 161363601145 - 2³ = 161363601137 is a prime.

It is a super-2 number, since 2×161363601145² (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 3 ways as a sum of consecutive naturals, for example, 16136360110 + ... + 16136360119.

It is an arithmetic number, because the mean of its divisors is an integer number (48409080345).

Almost surely, 2^161363601145 is an apocalyptic number.

It is an amenable number.

161363601145 is a deficient number, since it is larger than the sum of its proper divisors (32272720235).

161363601145 is an equidigital number, since it uses as much as digits as its factorization.

161363601145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32272720234.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 161363601145 in words is "one hundred sixty-one billion, three hundred sixty-three million, six hundred one thousand, one hundred forty-five".