668774471 has 4 divisors (see below), whose sum is σ = 668842944. Its totient is φ = 668706000.

The previous prime is 668774459. The next prime is 668774479. The reversal of 668774471 is 174477866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 668774471 - 2²⁶ = 601665607 is a prime.

It is a super-3 number, since 3×668774471³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668774479) 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, 16535 + ... + 40136.

It is an arithmetic number, because the mean of its divisors is an integer number (167210736).

Almost surely, 2^668774471 is an apocalyptic number.

668774471 is a deficient number, since it is larger than the sum of its proper divisors (68473).

668774471 is a wasteful number, since it uses less digits than its factorization.

668774471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68472.

The product of its digits is 1580544, while the sum is 50.

The square root of 668774471 is about 25860.6742178157. The cubic root of 668774471 is about 874.5001644872.

The spelling of 668774471 in words is "six hundred sixty-eight million, seven hundred seventy-four thousand, four hundred seventy-one".