19965213015593 has 2 divisors, whose sum is σ = 19965213015594. Its totient is φ = 19965213015592.

The previous prime is 19965213015577. The next prime is 19965213015667. The reversal of 19965213015593 is 39551031256991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16947029522329 + 3018183493264 = 4116677^2 + 1737292^2 .

It is a cyclic number.

It is not a de Polignac number, because 19965213015593 - 2⁴ = 19965213015577 is a prime.

It is a super-2 number, since 2×19965213015593² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19961213015593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9982606507796 + 9982606507797.

It is an arithmetic number, because the mean of its divisors is an integer number (9982606507797).

Almost surely, 2^{19965213015593} is an apocalyptic number.

It is an amenable number.

19965213015593 is a deficient number, since it is larger than the sum of its proper divisors (1).

19965213015593 is an equidigital number, since it uses as much as digits as its factorization.

19965213015593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9841500, while the sum is 59.

The spelling of 19965213015593 in words is "nineteen trillion, nine hundred sixty-five billion, two hundred thirteen million, fifteen thousand, five hundred ninety-three".