161651206 has 8 divisors (see below), whose sum is σ = 243518184. Its totient is φ = 80478480.

The previous prime is 161651197. The next prime is 161651239. The reversal of 161651206 is 602156161.

161651206 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161651206² = 52262224802508872, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 172980 + ... + 173911.

It is an arithmetic number, because the mean of its divisors is an integer number (30439773).

Almost surely, 2^161651206 is an apocalyptic number.

161651206 is a deficient number, since it is larger than the sum of its proper divisors (81866978).

161651206 is a wasteful number, since it uses less digits than its factorization.

161651206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347126.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161651206 is about 12714.2127558099. The cubic root of 161651206 is about 544.7446616934.

It can be divided in two parts, 16165 and 1206, that added together give a palindrome (17371).

The spelling of 161651206 in words is "one hundred sixty-one million, six hundred fifty-one thousand, two hundred six".