19664048653 has 2 divisors, whose sum is σ = 19664048654. Its totient is φ = 19664048652.

The previous prime is 19664048629. The next prime is 19664048717. The reversal of 19664048653 is 35684046691.

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., 18219060484 + 1444988169 = 134978^2 + 38013^2 .

It is an emirp because it is prime and its reverse (35684046691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19664048653 is a prime.

It is a super-2 number, since 2×19664048653² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19664048653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19664048623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9832024326 + 9832024327.

It is an arithmetic number, because the mean of its divisors is an integer number (9832024327).

Almost surely, 2^19664048653 is an apocalyptic number.

It is an amenable number.

19664048653 is a deficient number, since it is larger than the sum of its proper divisors (1).

19664048653 is an equidigital number, since it uses as much as digits as its factorization.

19664048653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The spelling of 19664048653 in words is "nineteen billion, six hundred sixty-four million, forty-eight thousand, six hundred fifty-three".