161813067278 has 8 divisors (see below), whose sum is σ = 243048046440. Its totient is φ = 80797051800.

The previous prime is 161813067233. The next prime is 161813067287. The reversal of 161813067278 is 872760318161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54739073 + ... + 54742028.

It is an arithmetic number, because the mean of its divisors is an integer number (30381005805).

Almost surely, 2^161813067278 is an apocalyptic number.

161813067278 is a deficient number, since it is larger than the sum of its proper divisors (81234979162).

161813067278 is a wasteful number, since it uses less digits than its factorization.

161813067278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109481842.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 161813067278 in words is "one hundred sixty-one billion, eight hundred thirteen million, sixty-seven thousand, two hundred seventy-eight".