19690255577 has 2 divisors, whose sum is σ = 19690255578. Its totient is φ = 19690255576.

The previous prime is 19690255573. The next prime is 19690255583. The reversal of 19690255577 is 77555209691.

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., 17205831241 + 2484424336 = 131171^2 + 49844^2 .

It is a cyclic number.

It is not a de Polignac number, because 19690255577 - 2² = 19690255573 is a prime.

It is not a weakly prime, because it can be changed into another prime (19690255573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9845127788 + 9845127789.

It is an arithmetic number, because the mean of its divisors is an integer number (9845127789).

Almost surely, 2^19690255577 is an apocalyptic number.

It is an amenable number.

19690255577 is a deficient number, since it is larger than the sum of its proper divisors (1).

19690255577 is an equidigital number, since it uses as much as digits as its factorization.

19690255577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5953500, while the sum is 56.

The spelling of 19690255577 in words is "nineteen billion, six hundred ninety million, two hundred fifty-five thousand, five hundred seventy-seven".