668860101 has 48 divisors (see below), whose sum is σ = 1218147840. Its totient is φ = 344183040.

The previous prime is 668860081. The next prime is 668860109. The reversal of 668860101 is 101068866.

668860101 = 4019² + 4020² + ... + 4059².

It is not a de Polignac number, because 668860101 - 2⁶ = 668860037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668860109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23620 + ... + 43538.

It is an arithmetic number, because the mean of its divisors is an integer number (25378080).

Almost surely, 2^668860101 is an apocalyptic number.

It is an amenable number.

668860101 is a deficient number, since it is larger than the sum of its proper divisors (549287739).

668860101 is a wasteful number, since it uses less digits than its factorization.

668860101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19986 (or 19983 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 668860101 is about 25862.3297674436. The cubic root of 668860101 is about 874.5374866123.

The spelling of 668860101 in words is "six hundred sixty-eight million, eight hundred sixty thousand, one hundred one".