19597398902773 has 2 divisors, whose sum is σ = 19597398902774. Its totient is φ = 19597398902772.

The previous prime is 19597398902749. The next prime is 19597398902909. The reversal of 19597398902773 is 37720989379591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15209555403249 + 4387843499524 = 3899943^2 + 2094718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19597398902773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19597398902693 and 19597398902702.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19597398932773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9798699451386 + 9798699451387.

It is an arithmetic number, because the mean of its divisors is an integer number (9798699451387).

Almost surely, 2^{19597398902773} is an apocalyptic number.

It is an amenable number.

19597398902773 is a deficient number, since it is larger than the sum of its proper divisors (1).

19597398902773 is an equidigital number, since it uses as much as digits as its factorization.

19597398902773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620304560, while the sum is 79.

The spelling of 19597398902773 in words is "nineteen trillion, five hundred ninety-seven billion, three hundred ninety-eight million, nine hundred two thousand, seven hundred seventy-three".