161646193339 has 4 divisors (see below), whose sum is σ = 161686945024. Its totient is φ = 161605441656.

The previous prime is 161646193337. The next prime is 161646193363. The reversal of 161646193339 is 933391646161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 933391646161 = 13 ⋅71799357397.

It is a cyclic number.

It is not a de Polignac number, because 161646193339 - 2¹ = 161646193337 is a prime.

It is a super-2 number, since 2×161646193339² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161646193337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20369892 + ... + 20377825.

It is an arithmetic number, because the mean of its divisors is an integer number (40421736256).

Almost surely, 2^161646193339 is an apocalyptic number.

161646193339 is a deficient number, since it is larger than the sum of its proper divisors (40751685).

161646193339 is an equidigital number, since it uses as much as digits as its factorization.

161646193339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40751684.

The product of its digits is 1889568, while the sum is 52.

The spelling of 161646193339 in words is "one hundred sixty-one billion, six hundred forty-six million, one hundred ninety-three thousand, three hundred thirty-nine".