668416783 has 2 divisors, whose sum is σ = 668416784. Its totient is φ = 668416782.

The previous prime is 668416769. The next prime is 668416807. The reversal of 668416783 is 387614866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668416783 - 2¹³ = 668408591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668416703) 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, 334208391 + 334208392.

It is an arithmetic number, because the mean of its divisors is an integer number (334208392).

Almost surely, 2^668416783 is an apocalyptic number.

668416783 is a deficient number, since it is larger than the sum of its proper divisors (1).

668416783 is an equidigital number, since it uses as much as digits as its factorization.

668416783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 668416783 is about 25853.7576185745. The cubic root of 668416783 is about 874.3442305061.

The spelling of 668416783 in words is "six hundred sixty-eight million, four hundred sixteen thousand, seven hundred eighty-three".