161142548278 has 4 divisors (see below), whose sum is σ = 241713822420. Its totient is φ = 80571274138.

The previous prime is 161142548221. The next prime is 161142548291. The reversal of 161142548278 is 872845241161.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 40285637068 + ... + 40285637071.

It is an arithmetic number, because the mean of its divisors is an integer number (60428455605).

Almost surely, 2^161142548278 is an apocalyptic number.

161142548278 is a deficient number, since it is larger than the sum of its proper divisors (80571274142).

161142548278 is an equidigital number, since it uses as much as digits as its factorization.

161142548278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80571274141.

The product of its digits is 860160, while the sum is 49.

The spelling of 161142548278 in words is "one hundred sixty-one billion, one hundred forty-two million, five hundred forty-eight thousand, two hundred seventy-eight".