161745232813 has 8 divisors (see below), whose sum is σ = 162025904160. Its totient is φ = 161464697520.

The previous prime is 161745232807. The next prime is 161745232949. The reversal of 161745232813 is 318232547161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161745232813 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 161745232813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161745232013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2508978 + ... + 2572636.

It is an arithmetic number, because the mean of its divisors is an integer number (20253238020).

Almost surely, 2^161745232813 is an apocalyptic number.

It is an amenable number.

161745232813 is a deficient number, since it is larger than the sum of its proper divisors (280671347).

161745232813 is an equidigital number, since it uses as much as digits as its factorization.

161745232813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68027.

The product of its digits is 241920, while the sum is 43.

Adding to 161745232813 its reverse (318232547161), we get a palindrome (479977779974).

The spelling of 161745232813 in words is "one hundred sixty-one billion, seven hundred forty-five million, two hundred thirty-two thousand, eight hundred thirteen".