161805470785 has 12 divisors (see below), whose sum is σ = 225867228948. Its totient is φ = 110952322656.

The previous prime is 161805470767. The next prime is 161805470831. The reversal of 161805470785 is 587074508161.

It can be written as a sum of positive squares in 2 ways, for example, as 32596135936 + 129209334849 = 180544^2 + 359457^2 .

It is not a de Polignac number, because 161805470785 - 2²⁷ = 161671253057 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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330215002 + ... + 330215491.

It is an arithmetic number, because the mean of its divisors is an integer number (18822269079).

Almost surely, 2^161805470785 is an apocalyptic number.

It is an amenable number.

161805470785 is a deficient number, since it is larger than the sum of its proper divisors (64061758163).

161805470785 is an equidigital number, since it uses as much as digits as its factorization.

161805470785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660430512 (or 660430505 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 52.

The spelling of 161805470785 in words is "one hundred sixty-one billion, eight hundred five million, four hundred seventy thousand, seven hundred eighty-five".