161133962845 has 4 divisors (see below), whose sum is σ = 193360755420. Its totient is φ = 128907170272.

The previous prime is 161133962837. The next prime is 161133962861. The reversal of 161133962845 is 548269331161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548269331161 = 23 ⋅23837797007.

It can be written as a sum of positive squares in 2 ways, for example, as 46230590169 + 114903372676 = 215013^2 + 338974^2 .

It is a cyclic number.

It is not a de Polignac number, because 161133962845 - 2³ = 161133962837 is a prime.

It is a congruent number.

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, 16113396280 + ... + 16113396289.

It is an arithmetic number, because the mean of its divisors is an integer number (48340188855).

Almost surely, 2^161133962845 is an apocalyptic number.

It is an amenable number.

161133962845 is a deficient number, since it is larger than the sum of its proper divisors (32226792575).

161133962845 is an equidigital number, since it uses as much as digits as its factorization.

161133962845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32226792574.

The product of its digits is 933120, while the sum is 49.

The spelling of 161133962845 in words is "one hundred sixty-one billion, one hundred thirty-three million, nine hundred sixty-two thousand, eight hundred forty-five".