668853691 has 8 divisors (see below), whose sum is σ = 746627904. Its totient is φ = 593907720.

The previous prime is 668853671. The next prime is 668853721. The reversal of 668853691 is 196358866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668853691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668853631) 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, 706561 + ... + 707506.

It is an arithmetic number, because the mean of its divisors is an integer number (93328488).

Almost surely, 2^668853691 is an apocalyptic number.

668853691 is a deficient number, since it is larger than the sum of its proper divisors (77774213).

668853691 is a wasteful number, since it uses less digits than its factorization.

668853691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414121.

The product of its digits is 1866240, while the sum is 52.

The square root of 668853691 is about 25862.2058417297. The cubic root of 668853691 is about 874.5346929024.

The spelling of 668853691 in words is "six hundred sixty-eight million, eight hundred fifty-three thousand, six hundred ninety-one".