1664461467593 has 2 divisors, whose sum is σ = 1664461467594. Its totient is φ = 1664461467592.

The previous prime is 1664461467577. The next prime is 1664461467719. The reversal of 1664461467593 is 3957641644661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1645788791689 + 18672675904 = 1282883^2 + 136648^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664461467593 - 2⁴ = 1664461467577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664461467523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832230733796 + 832230733797.

It is an arithmetic number, because the mean of its divisors is an integer number (832230733797).

Almost surely, 2^{1664461467593} is an apocalyptic number.

It is an amenable number.

1664461467593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664461467593 is an equidigital number, since it uses as much as digits as its factorization.

1664461467593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78382080, while the sum is 62.

The spelling of 1664461467593 in words is "one trillion, six hundred sixty-four billion, four hundred sixty-one million, four hundred sixty-seven thousand, five hundred ninety-three".