164388891593 has 2 divisors, whose sum is σ = 164388891594. Its totient is φ = 164388891592.

The previous prime is 164388891559. The next prime is 164388891607. The reversal of 164388891593 is 395198883461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154738383424 + 9650508169 = 393368^2 + 98237^2 .

It is a cyclic number.

It is not a de Polignac number, because 164388891593 - 2⁶ = 164388891529 is a prime.

It is not a weakly prime, because it can be changed into another prime (164388891893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82194445796 + 82194445797.

It is an arithmetic number, because the mean of its divisors is an integer number (82194445797).

Almost surely, 2^164388891593 is an apocalyptic number.

It is an amenable number.

164388891593 is a deficient number, since it is larger than the sum of its proper divisors (1).

164388891593 is an equidigital number, since it uses as much as digits as its factorization.

164388891593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44789760, while the sum is 65.

The spelling of 164388891593 in words is "one hundred sixty-four billion, three hundred eighty-eight million, eight hundred ninety-one thousand, five hundred ninety-three".