19907580779 has 2 divisors, whose sum is σ = 19907580780. Its totient is φ = 19907580778.

The previous prime is 19907580697. The next prime is 19907580811. The reversal of 19907580779 is 97708570991.

It is a strong prime.

It is an emirp because it is prime and its reverse (97708570991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19907580779 - 2²⁴ = 19890803563 is a prime.

It is not a weakly prime, because it can be changed into another prime (19907580479) 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, 9953790389 + 9953790390.

It is an arithmetic number, because the mean of its divisors is an integer number (9953790390).

Almost surely, 2^19907580779 is an apocalyptic number.

19907580779 is a deficient number, since it is larger than the sum of its proper divisors (1).

19907580779 is an equidigital number, since it uses as much as digits as its factorization.

19907580779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10001880, while the sum is 62.

The spelling of 19907580779 in words is "nineteen billion, nine hundred seven million, five hundred eighty thousand, seven hundred seventy-nine".