686658001 has 2 divisors, whose sum is σ = 686658002. Its totient is φ = 686658000.

The previous prime is 686657987. The next prime is 686658017. The reversal of 686658001 is 100856686.

It is a happy number.

686658001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686387601 + 270400 = 26199^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686658001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686658601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343329000 + 343329001.

It is an arithmetic number, because the mean of its divisors is an integer number (343329001).

Almost surely, 2^686658001 is an apocalyptic number.

It is an amenable number.

686658001 is a deficient number, since it is larger than the sum of its proper divisors (1).

686658001 is an equidigital number, since it uses as much as digits as its factorization.

686658001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 686658001 is about 26204.1599941689. The cubic root of 686658001 is about 882.2266275753.

The spelling of 686658001 in words is "six hundred eighty-six million, six hundred fifty-eight thousand, one".