668176853 has 4 divisors (see below), whose sum is σ = 672178080. Its totient is φ = 664175628.

The previous prime is 668176793. The next prime is 668176879. The reversal of 668176853 is 358671866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668176853 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 (668106853) 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, 2000363 + ... + 2000696.

It is an arithmetic number, because the mean of its divisors is an integer number (168044520).

Almost surely, 2^668176853 is an apocalyptic number.

It is an amenable number.

668176853 is a deficient number, since it is larger than the sum of its proper divisors (4001227).

668176853 is a wasteful number, since it uses less digits than its factorization.

668176853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001226.

The product of its digits is 1451520, while the sum is 50.

The square root of 668176853 is about 25849.1170642248. The cubic root of 668176853 is about 874.2396019160.

The spelling of 668176853 in words is "six hundred sixty-eight million, one hundred seventy-six thousand, eight hundred fifty-three".