161442393689 has 4 divisors (see below), whose sum is σ = 161539241424. Its totient is φ = 161345545956.

The previous prime is 161442393677. The next prime is 161442393713. The reversal of 161442393689 is 986393244161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986393244161 = 13 ⋅75876403397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161442393689 is a prime.

It is a super-3 number, since 3×161442393689³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161442393089) 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, 48421367 + ... + 48424700.

It is an arithmetic number, because the mean of its divisors is an integer number (40384810356).

Almost surely, 2^161442393689 is an apocalyptic number.

It is an amenable number.

161442393689 is a deficient number, since it is larger than the sum of its proper divisors (96847735).

161442393689 is an equidigital number, since it uses as much as digits as its factorization.

161442393689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96847734.

The product of its digits is 6718464, while the sum is 56.

The spelling of 161442393689 in words is "one hundred sixty-one billion, four hundred forty-two million, three hundred ninety-three thousand, six hundred eighty-nine".