20199723653 has 2 divisors, whose sum is σ = 20199723654. Its totient is φ = 20199723652.

The previous prime is 20199723647. The next prime is 20199723701. The reversal of 20199723653 is 35632799102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20146111969 + 53611684 = 141937^2 + 7322^2 .

It is a cyclic number.

It is not a de Polignac number, because 20199723653 - 2⁴ = 20199723637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20199723598 and 20199723607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20199723053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099861826 + 10099861827.

It is an arithmetic number, because the mean of its divisors is an integer number (10099861827).

Almost surely, 2^20199723653 is an apocalyptic number.

It is an amenable number.

20199723653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199723653 is an equidigital number, since it uses as much as digits as its factorization.

20199723653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 20199723653 in words is "twenty billion, one hundred ninety-nine million, seven hundred twenty-three thousand, six hundred fifty-three".