743666321 has 2 divisors, whose sum is σ = 743666322. Its totient is φ = 743666320.

The previous prime is 743666317. The next prime is 743666353. The reversal of 743666321 is 123666347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695904400 + 47761921 = 26380^2 + 6911^2 .

It is a cyclic number.

It is not a de Polignac number, because 743666321 - 2² = 743666317 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (743606321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371833160 + 371833161.

It is an arithmetic number, because the mean of its divisors is an integer number (371833161).

Almost surely, 2^743666321 is an apocalyptic number.

It is an amenable number.

743666321 is a deficient number, since it is larger than the sum of its proper divisors (1).

743666321 is an equidigital number, since it uses as much as digits as its factorization.

743666321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The square root of 743666321 is about 27270.2460751640. The cubic root of 743666321 is about 905.9954944085.

The spelling of 743666321 in words is "seven hundred forty-three million, six hundred sixty-six thousand, three hundred twenty-one".