161094395138 has 4 divisors (see below), whose sum is σ = 241641592710. Its totient is φ = 80547197568.

The previous prime is 161094395131. The next prime is 161094395171. The reversal of 161094395138 is 831593490161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831593490161 = 7 ⋅118799070023.

It can be written as a sum of positive squares in only one way, i.e., 134276074969 + 26818320169 = 366437^2 + 163763^2 .

It is not an unprimeable number, because it can be changed into a prime (161094395131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40273598783 + ... + 40273598786.

Almost surely, 2^161094395138 is an apocalyptic number.

161094395138 is a deficient number, since it is larger than the sum of its proper divisors (80547197572).

161094395138 is an equidigital number, since it uses as much as digits as its factorization.

161094395138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80547197571.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 161094395138 in words is "one hundred sixty-one billion, ninety-four million, three hundred ninety-five thousand, one hundred thirty-eight".