668168247 has 4 divisors (see below), whose sum is σ = 890891000. Its totient is φ = 445445496.

The previous prime is 668168219. The next prime is 668168339. The reversal of 668168247 is 742861866.

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

It is not a de Polignac number, because 668168247 - 2⁶ = 668168183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668168196 and 668168205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668168447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111361372 + ... + 111361377.

It is an arithmetic number, because the mean of its divisors is an integer number (222722750).

Almost surely, 2^668168247 is an apocalyptic number.

668168247 is a deficient number, since it is larger than the sum of its proper divisors (222722753).

668168247 is a wasteful number, since it uses less digits than its factorization.

668168247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222722752.

The product of its digits is 774144, while the sum is 48.

The square root of 668168247 is about 25848.9505976548. The cubic root of 668168247 is about 874.2358485493.

The spelling of 668168247 in words is "six hundred sixty-eight million, one hundred sixty-eight thousand, two hundred forty-seven".