168449506 has 4 divisors (see below), whose sum is σ = 252674262. Its totient is φ = 84224752.

The previous prime is 168449503. The next prime is 168449507. The reversal of 168449506 is 605944861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605944861 = 9851 ⋅61511.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 23126481 = 12055^2 + 4809^2 .

It is not an unprimeable number, because it can be changed into a prime (168449503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42112375 + ... + 42112378.

Almost surely, 2^168449506 is an apocalyptic number.

168449506 is a deficient number, since it is larger than the sum of its proper divisors (84224756).

168449506 is an equidigital number, since it uses as much as digits as its factorization.

168449506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84224755.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 168449506 is about 12978.8098838068. The cubic root of 168449506 is about 552.2765212080.

The spelling of 168449506 in words is "one hundred sixty-eight million, four hundred forty-nine thousand, five hundred six".