668115803 has 4 divisors (see below), whose sum is σ = 668201448. Its totient is φ = 668030160.

The previous prime is 668115781. The next prime is 668115821. The reversal of 668115803 is 308511866.

It is a happy number.

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-668115803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668115853) 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, 29801 + ... + 47162.

It is an arithmetic number, because the mean of its divisors is an integer number (167050362).

Almost surely, 2^668115803 is an apocalyptic number.

668115803 is a deficient number, since it is larger than the sum of its proper divisors (85645).

668115803 is an equidigital number, since it uses as much as digits as its factorization.

668115803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85644.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 668115803 is about 25847.9361458512. The cubic root of 668115803 is about 874.2129752562.

The spelling of 668115803 in words is "six hundred sixty-eight million, one hundred fifteen thousand, eight hundred three".