1643327057 has 2 divisors, whose sum is σ = 1643327058. Its totient is φ = 1643327056.

The previous prime is 1643327047. The next prime is 1643327071. The reversal of 1643327057 is 7507233461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1616120401 + 27206656 = 40201^2 + 5216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643327057 - 2⁸ = 1643326801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1643327057.

It is not a weakly prime, because it can be changed into another prime (1643327047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821663528 + 821663529.

It is an arithmetic number, because the mean of its divisors is an integer number (821663529).

Almost surely, 2^1643327057 is an apocalyptic number.

It is an amenable number.

1643327057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643327057 is an equidigital number, since it uses as much as digits as its factorization.

1643327057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 1643327057 is about 40537.9705584776. The cubic root of 1643327057 is about 1180.0706308866.

The spelling of 1643327057 in words is "one billion, six hundred forty-three million, three hundred twenty-seven thousand, fifty-seven".