19455912893 has 2 divisors, whose sum is σ = 19455912894. Its totient is φ = 19455912892.

The previous prime is 19455912877. The next prime is 19455912919. The reversal of 19455912893 is 39821955491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19453833529 + 2079364 = 139477^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 19455912893 - 2⁴ = 19455912877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19455918893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9727956446 + 9727956447.

It is an arithmetic number, because the mean of its divisors is an integer number (9727956447).

Almost surely, 2^19455912893 is an apocalyptic number.

It is an amenable number.

19455912893 is a deficient number, since it is larger than the sum of its proper divisors (1).

19455912893 is an equidigital number, since it uses as much as digits as its factorization.

19455912893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 56.

The spelling of 19455912893 in words is "nineteen billion, four hundred fifty-five million, nine hundred twelve thousand, eight hundred ninety-three".