168689474 has 4 divisors (see below), whose sum is σ = 253034214. Its totient is φ = 84344736.

The previous prime is 168689441. The next prime is 168689483. The reversal of 168689474 is 474986861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 116488849 + 52200625 = 10793^2 + 7225^2 .

It is a super-3 number, since 3×168689474³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42172367 + ... + 42172370.

Almost surely, 2^168689474 is an apocalyptic number.

168689474 is a deficient number, since it is larger than the sum of its proper divisors (84344740).

168689474 is an equidigital number, since it uses as much as digits as its factorization.

168689474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84344739.

The product of its digits is 2322432, while the sum is 53.

The square root of 168689474 is about 12988.0512010078. The cubic root of 168689474 is about 552.5386488391.

The spelling of 168689474 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, four hundred seventy-four".