9999642433493 has 2 divisors, whose sum is σ = 9999642433494. Its totient is φ = 9999642433492.

The previous prime is 9999642433471. The next prime is 9999642433579. The reversal of 9999642433493 is 3943342469999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8742234552529 + 1257407880964 = 2956727^2 + 1121342^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999642433493 - 2¹² = 9999642429397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9999642433493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9999642433453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999821216746 + 4999821216747.

It is an arithmetic number, because the mean of its divisors is an integer number (4999821216747).

Almost surely, 2^{9999642433493} is an apocalyptic number.

It is an amenable number.

9999642433493 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999642433493 is an equidigital number, since it uses as much as digits as its factorization.

9999642433493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224440064, while the sum is 74.

The spelling of 9999642433493 in words is "nine trillion, nine hundred ninety-nine billion, six hundred forty-two million, four hundred thirty-three thousand, four hundred ninety-three".