668940468897 has 8 divisors (see below), whose sum is σ = 891927494080. Its totient is φ = 445956878160.

The previous prime is 668940468871. The next prime is 668940468923. The reversal of 668940468897 is 798864049866.

It is an interprime number because it is at equal distance from previous prime (668940468871) and next prime (668940468923).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668940468897 - 2⁸ = 668940468641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668940488897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363322 + ... + 1212387.

It is an arithmetic number, because the mean of its divisors is an integer number (111490936760).

Almost surely, 2^668940468897 is an apocalyptic number.

It is an amenable number.

668940468897 is a deficient number, since it is larger than the sum of its proper divisors (222987025183).

668940468897 is a wasteful number, since it uses less digits than its factorization.

668940468897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717223.

The product of its (nonzero) digits is 1003290624, while the sum is 75.

The spelling of 668940468897 in words is "six hundred sixty-eight billion, nine hundred forty million, four hundred sixty-eight thousand, eight hundred ninety-seven".