668946479 has 2 divisors, whose sum is σ = 668946480. Its totient is φ = 668946478.

The previous prime is 668946469. The next prime is 668946503. The reversal of 668946479 is 974649866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668946479 - 2¹⁶ = 668880943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668946409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334473239 + 334473240.

It is an arithmetic number, because the mean of its divisors is an integer number (334473240).

Almost surely, 2^668946479 is an apocalyptic number.

668946479 is a deficient number, since it is larger than the sum of its proper divisors (1).

668946479 is an equidigital number, since it uses as much as digits as its factorization.

668946479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 59.

The square root of 668946479 is about 25863.9996713579. Note that the first 3 decimals coincide. The cubic root of 668946479 is about 874.5751315285.

The spelling of 668946479 in words is "six hundred sixty-eight million, nine hundred forty-six thousand, four hundred seventy-nine".