19877743619 has 2 divisors, whose sum is σ = 19877743620. Its totient is φ = 19877743618.

The previous prime is 19877743597. The next prime is 19877743657. The reversal of 19877743619 is 91634777891.

It is a weak prime.

It is an emirp because it is prime and its reverse (91634777891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19877743619 is a prime.

It is a super-2 number, since 2×19877743619² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19877743679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9938871809 + 9938871810.

It is an arithmetic number, because the mean of its divisors is an integer number (9938871810).

Almost surely, 2^19877743619 is an apocalyptic number.

19877743619 is a deficient number, since it is larger than the sum of its proper divisors (1).

19877743619 is an equidigital number, since it uses as much as digits as its factorization.

19877743619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 62.

The spelling of 19877743619 in words is "nineteen billion, eight hundred seventy-seven million, seven hundred forty-three thousand, six hundred nineteen".