668701499 has 2 divisors, whose sum is σ = 668701500. Its totient is φ = 668701498.

The previous prime is 668701489. The next prime is 668701543. The reversal of 668701499 is 994107866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668701499 - 2¹⁶ = 668635963 is a prime.

It is not a weakly prime, because it can be changed into another prime (668701489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334350749 + 334350750.

It is an arithmetic number, because the mean of its divisors is an integer number (334350750).

Almost surely, 2^668701499 is an apocalyptic number.

668701499 is a deficient number, since it is larger than the sum of its proper divisors (1).

668701499 is an equidigital number, since it uses as much as digits as its factorization.

668701499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 668701499 is about 25859.2633112392. The cubic root of 668701499 is about 874.4683568800.

The spelling of 668701499 in words is "six hundred sixty-eight million, seven hundred one thousand, four hundred ninety-nine".