1664360393 has 2 divisors, whose sum is σ = 1664360394. Its totient is φ = 1664360392.

The previous prime is 1664360363. The next prime is 1664360407. The reversal of 1664360393 is 3930634661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1629171769 + 35188624 = 40363^2 + 5932^2 .

It is an emirp because it is prime and its reverse (3930634661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664360393 - 2⁶ = 1664360329 is a prime.

It is a super-2 number, since 2×1664360393² = 5540191035574228898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1664360393.

It is not a weakly prime, because it can be changed into another prime (1664360353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832180196 + 832180197.

It is an arithmetic number, because the mean of its divisors is an integer number (832180197).

Almost surely, 2^1664360393 is an apocalyptic number.

It is an amenable number.

1664360393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664360393 is an equidigital number, since it uses as much as digits as its factorization.

1664360393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 41.

The square root of 1664360393 is about 40796.5732997270. The cubic root of 1664360393 is about 1185.0839710950.

The spelling of 1664360393 in words is "one billion, six hundred sixty-four million, three hundred sixty thousand, three hundred ninety-three".