668471517 has 24 divisors (see below), whose sum is σ = 1151489664. Its totient is φ = 365374944.

The previous prime is 668471443. The next prime is 668471521. The reversal of 668471517 is 715174866.

668471517 is a `hidden beast` number, since 6 + 68 + 4 + 71 + 517 = 666.

668471517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668471517 - 2⁷ = 668471389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668471527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229218 + ... + 232115.

It is an arithmetic number, because the mean of its divisors is an integer number (47978736).

Almost surely, 2^668471517 is an apocalyptic number.

It is an amenable number.

668471517 is a deficient number, since it is larger than the sum of its proper divisors (483018147).

668471517 is a wasteful number, since it uses less digits than its factorization.

668471517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461369 (or 461366 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 668471517 is about 25854.8161277546. The cubic root of 668471517 is about 874.3680953821.

The spelling of 668471517 in words is "six hundred sixty-eight million, four hundred seventy-one thousand, five hundred seventeen".