19779609601 has 2 divisors, whose sum is σ = 19779609602. Its totient is φ = 19779609600.

The previous prime is 19779609569. The next prime is 19779609617. The reversal of 19779609601 is 10690697791.

It is a Cunningham number, because it is equal to 140640²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19779609600 + 1 = 140640^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 19779609601 - 2⁵ = 19779609569 is a prime.

It is not a weakly prime, because it can be changed into another prime (19779609671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889804800 + 9889804801.

It is an arithmetic number, because the mean of its divisors is an integer number (9889804801).

Almost surely, 2^19779609601 is an apocalyptic number.

It is an amenable number.

19779609601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19779609601 is an equidigital number, since it uses as much as digits as its factorization.

19779609601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The spelling of 19779609601 in words is "nineteen billion, seven hundred seventy-nine million, six hundred nine thousand, six hundred one".