668337651559 has 4 divisors (see below), whose sum is σ = 668356202704. Its totient is φ = 668319100416.

The previous prime is 668337651547. The next prime is 668337651607. The reversal of 668337651559 is 955156733866.

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

It is a cyclic number.

It is not a de Polignac number, because 668337651559 - 2²⁵ = 668304097127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668337651559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668307651559) 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 3 ways as a sum of consecutive naturals, for example, 9221427 + ... + 9293620.

It is an arithmetic number, because the mean of its divisors is an integer number (167089050676).

Almost surely, 2^668337651559 is an apocalyptic number.

668337651559 is a deficient number, since it is larger than the sum of its proper divisors (18551145).

668337651559 is a wasteful number, since it uses less digits than its factorization.

668337651559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18551144.

The product of its digits is 122472000, while the sum is 64.

The spelling of 668337651559 in words is "six hundred sixty-eight billion, three hundred thirty-seven million, six hundred fifty-one thousand, five hundred fifty-nine".