161651806 has 8 divisors (see below), whose sum is σ = 245893104. Its totient is φ = 79687440.

The previous prime is 161651803. The next prime is 161651821. The reversal of 161651806 is 608156161.

161651806 is digitally balanced in base 2, 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 2×161651806² = 52262612766123272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161651801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569055 + ... + 569338.

It is an arithmetic number, because the mean of its divisors is an integer number (30736638).

Almost surely, 2^161651806 is an apocalyptic number.

161651806 is a deficient number, since it is larger than the sum of its proper divisors (84241298).

161651806 is a wasteful number, since it uses less digits than its factorization.

161651806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138466.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 161651806 is about 12714.2363514291. The cubic root of 161651806 is about 544.7453356680.

It can be divided in two parts, 16165 and 1806, that added together give a palindrome (17971).

The spelling of 161651806 in words is "one hundred sixty-one million, six hundred fifty-one thousand, eight hundred six".