161277926785 has 4 divisors (see below), whose sum is σ = 193533512148. Its totient is φ = 129022341424.

The previous prime is 161277926759. The next prime is 161277926801. The reversal of 161277926785 is 587629772161.

161277926785 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.

It can be written as a sum of positive squares in 2 ways, for example, as 121265525824 + 40012400961 = 348232^2 + 200031^2 .

It is a cyclic number.

It is not a de Polignac number, because 161277926785 - 2⁵ = 161277926753 is a prime.

It is a Duffinian 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 in 3 ways as a sum of consecutive naturals, for example, 16127792674 + ... + 16127792683.

It is an arithmetic number, because the mean of its divisors is an integer number (48383378037).

Almost surely, 2^161277926785 is an apocalyptic number.

It is an amenable number.

161277926785 is a deficient number, since it is larger than the sum of its proper divisors (32255585363).

161277926785 is an equidigital number, since it uses as much as digits as its factorization.

161277926785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32255585362.

The product of its digits is 17781120, while the sum is 61.

The spelling of 161277926785 in words is "one hundred sixty-one billion, two hundred seventy-seven million, nine hundred twenty-six thousand, seven hundred eighty-five".