743668657 has 2 divisors, whose sum is σ = 743668658. Its totient is φ = 743668656.

The previous prime is 743668649. The next prime is 743668669. The reversal of 743668657 is 756866347.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 692531856 + 51136801 = 26316^2 + 7151^2 .

It is a cyclic number.

It is not a de Polignac number, because 743668657 - 2³ = 743668649 is a prime.

It is not a weakly prime, because it can be changed into another prime (743669657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371834328 + 371834329.

It is an arithmetic number, because the mean of its divisors is an integer number (371834329).

Almost surely, 2^743668657 is an apocalyptic number.

It is an amenable number.

743668657 is a deficient number, since it is larger than the sum of its proper divisors (1).

743668657 is an equidigital number, since it uses as much as digits as its factorization.

743668657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The square root of 743668657 is about 27270.2889056937. The cubic root of 743668657 is about 905.9964430433.

The spelling of 743668657 in words is "seven hundred forty-three million, six hundred sixty-eight thousand, six hundred fifty-seven".