668196863 has 4 divisors (see below), whose sum is σ = 668485608. Its totient is φ = 667908120.

The previous prime is 668196853. The next prime is 668196871. The reversal of 668196863 is 368691866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668196863 is a prime.

It is a super-4 number, since 4×668196863⁴ (a number of 36 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668196853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140873 + ... + 145538.

It is an arithmetic number, because the mean of its divisors is an integer number (167121402).

Almost surely, 2^668196863 is an apocalyptic number.

668196863 is a deficient number, since it is larger than the sum of its proper divisors (288745).

668196863 is a wasteful number, since it uses less digits than its factorization.

668196863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288744.

The product of its digits is 2239488, while the sum is 53.

The square root of 668196863 is about 25849.5041151663. The cubic root of 668196863 is about 874.2483288270.

The spelling of 668196863 in words is "six hundred sixty-eight million, one hundred ninety-six thousand, eight hundred sixty-three".