161179766785 has 8 divisors (see below), whose sum is σ = 194397527016. Its totient is φ = 128289275520.

The previous prime is 161179766779. The next prime is 161179766807. The reversal of 161179766785 is 587667971161.

It is a Cunningham number, because it is equal to 401472²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 58025101456 + 103154665329 = 240884^2 + 321177^2 .

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

It is not a de Polignac number, because 161179766785 - 2⁹ = 161179766273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81816156 + ... + 81818125.

It is an arithmetic number, because the mean of its divisors is an integer number (24299690877).

Almost surely, 2^161179766785 is an apocalyptic number.

It is an amenable number.

161179766785 is a deficient number, since it is larger than the sum of its proper divisors (33217760231).

161179766785 is a wasteful number, since it uses less digits than its factorization.

161179766785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163634483.

The product of its digits is 26671680, while the sum is 64.

The spelling of 161179766785 in words is "one hundred sixty-one billion, one hundred seventy-nine million, seven hundred sixty-six thousand, seven hundred eighty-five".