161712785 has 16 divisors (see below), whose sum is σ = 209249040. Its totient is φ = 119266560.

The previous prime is 161712779. The next prime is 161712797. The reversal of 161712785 is 587217161.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 99760144 + 61952641 = 9988^2 + 7871^2 .

It is not a de Polignac number, because 161712785 - 2¹² = 161708689 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92015 + ... + 93755.

It is an arithmetic number, because the mean of its divisors is an integer number (13078065).

Almost surely, 2^161712785 is an apocalyptic number.

It is an amenable number.

161712785 is a deficient number, since it is larger than the sum of its proper divisors (47536255).

161712785 is a wasteful number, since it uses less digits than its factorization.

161712785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188.

The product of its digits is 23520, while the sum is 38.

The square root of 161712785 is about 12716.6341851922. The cubic root of 161712785 is about 544.8138241281.

The spelling of 161712785 in words is "one hundred sixty-one million, seven hundred twelve thousand, seven hundred eighty-five".