19508872811 has 2 divisors, whose sum is σ = 19508872812. Its totient is φ = 19508872810.

The previous prime is 19508872777. The next prime is 19508872813. The reversal of 19508872811 is 11827880591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19508872811 - 2²⁶ = 19441763947 is a prime.

It is a super-2 number, since 2×19508872811² (a number of 21 digits) contains 22 as substring.

Together with 19508872813, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19508872811.

It is not a weakly prime, because it can be changed into another prime (19508872813) 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, 9754436405 + 9754436406.

It is an arithmetic number, because the mean of its divisors is an integer number (9754436406).

Almost surely, 2^19508872811 is an apocalyptic number.

19508872811 is a deficient number, since it is larger than the sum of its proper divisors (1).

19508872811 is an equidigital number, since it uses as much as digits as its factorization.

19508872811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 50.

The spelling of 19508872811 in words is "nineteen billion, five hundred eight million, eight hundred seventy-two thousand, eight hundred eleven".