668834705447 has 4 divisors (see below), whose sum is σ = 671437175376. Its totient is φ = 666232235520.

The previous prime is 668834705443. The next prime is 668834705471. The reversal of 668834705447 is 744507438866.

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 668834705447 - 2² = 668834705443 is a prime.

It is a super-3 number, since 3×668834705447³ (a number of 36 digits) contains 333 as substring.

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 668834705447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668834705443) 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, 1301234579 + ... + 1301235092.

It is an arithmetic number, because the mean of its divisors is an integer number (167859293844).

Almost surely, 2^668834705447 is an apocalyptic number.

668834705447 is a deficient number, since it is larger than the sum of its proper divisors (2602469929).

668834705447 is a wasteful number, since it uses less digits than its factorization.

668834705447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602469928.

The product of its (nonzero) digits is 108380160, while the sum is 62.

The spelling of 668834705447 in words is "six hundred sixty-eight billion, eight hundred thirty-four million, seven hundred five thousand, four hundred forty-seven".