161686162 has 16 divisors (see below), whose sum is σ = 278503200. Its totient is φ = 69625440.

The previous prime is 161686127. The next prime is 161686237. The reversal of 161686162 is 261686161.

It is a super-4 number, since 4×161686162⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192987 + ... + 193822.

It is an arithmetic number, because the mean of its divisors is an integer number (17406450).

Almost surely, 2^161686162 is an apocalyptic number.

161686162 is a deficient number, since it is larger than the sum of its proper divisors (116817038).

161686162 is a wasteful number, since it uses less digits than its factorization.

161686162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386841.

The product of its digits is 20736, while the sum is 37.

The square root of 161686162 is about 12715.5873635472. The cubic root of 161686162 is about 544.7839246689.

Subtracting 161686162 from its reverse (261686161), we obtain a palindrome (99999999).

It can be divided in two parts, 1616 and 86162, that added together give a palindrome (87778).

The spelling of 161686162 in words is "one hundred sixty-one million, six hundred eighty-six thousand, one hundred sixty-two".