161545133321 has 16 divisors (see below), whose sum is σ = 189904642368. Its totient is φ = 135478526400.

The previous prime is 161545133297. The next prime is 161545133333. The reversal of 161545133321 is 123331545161.

161545133321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161545133321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161545133371) 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 15 ways as a sum of consecutive naturals, for example, 116651 + ... + 580256.

It is an arithmetic number, because the mean of its divisors is an integer number (11869040148).

Almost surely, 2^161545133321 is an apocalyptic number.

161545133321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161545133321 is a deficient number, since it is larger than the sum of its proper divisors (28359509047).

161545133321 is a wasteful number, since it uses less digits than its factorization.

161545133321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698552.

The product of its digits is 32400, while the sum is 35.

Adding to 161545133321 its reverse (123331545161), we get a palindrome (284876678482).

The spelling of 161545133321 in words is "one hundred sixty-one billion, five hundred forty-five million, one hundred thirty-three thousand, three hundred twenty-one".