19455912919 has 2 divisors, whose sum is σ = 19455912920. Its totient is φ = 19455912918.

The previous prime is 19455912893. The next prime is 19455912937. The reversal of 19455912919 is 91921955491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19455912919 - 2¹⁷ = 19455781847 is a prime.

It is a super-2 number, since 2×19455912919² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19455912919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19455972919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9727956459 + 9727956460.

It is an arithmetic number, because the mean of its divisors is an integer number (9727956460).

Almost surely, 2^19455912919 is an apocalyptic number.

19455912919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19455912919 is an equidigital number, since it uses as much as digits as its factorization.

19455912919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1312200, while the sum is 55.

The spelling of 19455912919 in words is "nineteen billion, four hundred fifty-five million, nine hundred twelve thousand, nine hundred nineteen".