1664304457 has 2 divisors, whose sum is σ = 1664304458. Its totient is φ = 1664304456.

The previous prime is 1664304401. The next prime is 1664304469. The reversal of 1664304457 is 7544034661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1650309376 + 13995081 = 40624^2 + 3741^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664304457 - 2⁷ = 1664304329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664304497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832152228 + 832152229.

It is an arithmetic number, because the mean of its divisors is an integer number (832152229).

Almost surely, 2^1664304457 is an apocalyptic number.

It is an amenable number.

1664304457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664304457 is an equidigital number, since it uses as much as digits as its factorization.

1664304457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 1664304457 is about 40795.8877461932. The cubic root of 1664304457 is about 1185.0706948038.

The spelling of 1664304457 in words is "one billion, six hundred sixty-four million, three hundred four thousand, four hundred fifty-seven".