19388430077 has 2 divisors, whose sum is σ = 19388430078. Its totient is φ = 19388430076.

The previous prime is 19388430041. The next prime is 19388430097. The reversal of 19388430077 is 77003488391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17162572036 + 2225858041 = 131006^2 + 47179^2 .

It is an emirp because it is prime and its reverse (77003488391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19388430077 - 2³² = 15093462781 is a prime.

It is a super-2 number, since 2×19388430077² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19388430007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9694215038 + 9694215039.

It is an arithmetic number, because the mean of its divisors is an integer number (9694215039).

Almost surely, 2^19388430077 is an apocalyptic number.

It is an amenable number.

19388430077 is a deficient number, since it is larger than the sum of its proper divisors (1).

19388430077 is an equidigital number, since it uses as much as digits as its factorization.

19388430077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 19388430077 in words is "nineteen billion, three hundred eighty-eight million, four hundred thirty thousand, seventy-seven".