161166031042 has 4 divisors (see below), whose sum is σ = 241749046566. Its totient is φ = 80583015520.

The previous prime is 161166031031. The next prime is 161166031051. The reversal of 161166031042 is 240130661161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240130661161 = 26021 ⋅9228341.

It can be written as a sum of positive squares in only one way, i.e., 132904722721 + 28261308321 = 364561^2 + 168111^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161166030995 and 161166031013.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40291507759 + ... + 40291507762.

Almost surely, 2^161166031042 is an apocalyptic number.

161166031042 is a deficient number, since it is larger than the sum of its proper divisors (80583015524).

161166031042 is an equidigital number, since it uses as much as digits as its factorization.

161166031042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80583015523.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 161166031042 in words is "one hundred sixty-one billion, one hundred sixty-six million, thirty-one thousand, forty-two".