668769243953 has 4 divisors (see below), whose sum is σ = 669780998388. Its totient is φ = 667757489520.

The previous prime is 668769243899. The next prime is 668769244001. The reversal of 668769243953 is 359342967866.

It is a happy number.

668769243953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 404314124449 + 264455119504 = 635857^2 + 514252^2 .

It is a cyclic number.

It is not a de Polignac number, because 668769243953 - 2³² = 664474276657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668769243853) 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, 505876226 + ... + 505877547.

It is an arithmetic number, because the mean of its divisors is an integer number (167445249597).

Almost surely, 2^668769243953 is an apocalyptic number.

It is an amenable number.

668769243953 is a deficient number, since it is larger than the sum of its proper divisors (1011754435).

668769243953 is a wasteful number, since it uses less digits than its factorization.

668769243953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011754434.

The product of its digits is 352719360, while the sum is 68.

The spelling of 668769243953 in words is "six hundred sixty-eight billion, seven hundred sixty-nine million, two hundred forty-three thousand, nine hundred fifty-three".