161276642278 has 4 divisors (see below), whose sum is σ = 241914963420. Its totient is φ = 80638321138.

The previous prime is 161276642269. The next prime is 161276642291. The reversal of 161276642278 is 872246672161.

161276642278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 872246672161 = 526397 ⋅1657013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40319160568 + ... + 40319160571.

It is an arithmetic number, because the mean of its divisors is an integer number (60478740855).

Almost surely, 2^161276642278 is an apocalyptic number.

161276642278 is a deficient number, since it is larger than the sum of its proper divisors (80638321142).

161276642278 is an equidigital number, since it uses as much as digits as its factorization.

161276642278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80638321141.

The product of its digits is 2709504, while the sum is 52.

The spelling of 161276642278 in words is "one hundred sixty-one billion, two hundred seventy-six million, six hundred forty-two thousand, two hundred seventy-eight".