168161997 has 8 divisors (see below), whose sum is σ = 227287744. Its totient is φ = 110572128.

The previous prime is 168161971. The next prime is 168162017. The reversal of 168161997 is 799161861.

168161997 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 not a de Polignac number, because 168161997 - 2¹² = 168157901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168161957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383713 + ... + 384150.

It is an arithmetic number, because the mean of its divisors is an integer number (28410968).

Almost surely, 2^168161997 is an apocalyptic number.

It is an amenable number.

168161997 is a deficient number, since it is larger than the sum of its proper divisors (59125747).

168161997 is an equidigital number, since it uses as much as digits as its factorization.

168161997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767939.

The product of its digits is 163296, while the sum is 48.

The square root of 168161997 is about 12967.7290610191. The cubic root of 168161997 is about 551.9621344274.

It can be divided in two parts, 168 and 161997, that added together give a triangular number (162165 = T₅₆₉).

The spelling of 168161997 in words is "one hundred sixty-eight million, one hundred sixty-one thousand, nine hundred ninety-seven".