161999782 has 12 divisors (see below), whose sum is σ = 282673260. Its totient is φ = 69428436.

The previous prime is 161999779. The next prime is 161999813. The reversal of 161999782 is 287999161.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 826432 + ... + 826627.

It is an arithmetic number, because the mean of its divisors is an integer number (23556105).

Almost surely, 2^161999782 is an apocalyptic number.

161999782 is a deficient number, since it is larger than the sum of its proper divisors (120673478).

161999782 is a wasteful number, since it uses less digits than its factorization.

161999782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653075 (or 1653068 counting only the distinct ones).

The product of its digits is 489888, while the sum is 52.

The square root of 161999782 is about 12727.9134975062. The cubic root of 161999782 is about 545.1359333234.

The spelling of 161999782 in words is "one hundred sixty-one million, nine hundred ninety-nine thousand, seven hundred eighty-two".