19790795343889 has 2 divisors, whose sum is σ = 19790795343890. Its totient is φ = 19790795343888.

The previous prime is 19790795343883. The next prime is 19790795343919. The reversal of 19790795343889 is 98834359709791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18285715392400 + 1505079951489 = 4276180^2 + 1226817^2 .

It is a cyclic number.

It is not a de Polignac number, because 19790795343889 - 2²³ = 19790786955281 is a prime.

It is not a weakly prime, because it can be changed into another prime (19790795343883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9895397671944 + 9895397671945.

It is an arithmetic number, because the mean of its divisors is an integer number (9895397671945).

Almost surely, 2^{19790795343889} is an apocalyptic number.

It is an amenable number.

19790795343889 is a deficient number, since it is larger than the sum of its proper divisors (1).

19790795343889 is an equidigital number, since it uses as much as digits as its factorization.

19790795343889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3703553280, while the sum is 82.

The spelling of 19790795343889 in words is "nineteen trillion, seven hundred ninety billion, seven hundred ninety-five million, three hundred forty-three thousand, eight hundred eighty-nine".