668692733 has 2 divisors, whose sum is σ = 668692734. Its totient is φ = 668692732.

The previous prime is 668692711. The next prime is 668692747. The reversal of 668692733 is 337296866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641203684 + 27489049 = 25322^2 + 5243^2 .

It is a cyclic number.

It is not a de Polignac number, because 668692733 - 2²⁶ = 601583869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668692033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334346366 + 334346367.

It is an arithmetic number, because the mean of its divisors is an integer number (334346367).

Almost surely, 2^668692733 is an apocalyptic number.

It is an amenable number.

668692733 is a deficient number, since it is larger than the sum of its proper divisors (1).

668692733 is an equidigital number, since it uses as much as digits as its factorization.

668692733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 50.

The square root of 668692733 is about 25859.0938162960. The cubic root of 668692733 is about 874.4645357315.

The spelling of 668692733 in words is "six hundred sixty-eight million, six hundred ninety-two thousand, seven hundred thirty-three".