668941747 has 8 divisors (see below), whose sum is σ = 672650640. Its totient is φ = 665240160.

The previous prime is 668941727. The next prime is 668941781. The reversal of 668941747 is 747149866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668941747 - 2²⁷ = 534724019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 668941694 and 668941703.

It is not an unprimeable number, because it can be changed into a prime (668941727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368472 + ... + 370282.

It is an arithmetic number, because the mean of its divisors is an integer number (84081330).

Almost surely, 2^668941747 is an apocalyptic number.

668941747 is a deficient number, since it is larger than the sum of its proper divisors (3708893).

668941747 is a wasteful number, since it uses less digits than its factorization.

668941747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653.

The product of its digits is 2032128, while the sum is 52.

The square root of 668941747 is about 25863.9081926920. The cubic root of 668941747 is about 874.5730693310.

The spelling of 668941747 in words is "six hundred sixty-eight million, nine hundred forty-one thousand, seven hundred forty-seven".