19890566341 has 2 divisors, whose sum is σ = 19890566342. Its totient is φ = 19890566340.

The previous prime is 19890566323. The next prime is 19890566387. The reversal of 19890566341 is 14366509891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10296363841 + 9594202500 = 101471^2 + 97950^2 .

It is an emirp because it is prime and its reverse (14366509891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19890566341 - 2¹⁷ = 19890435269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19890566441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945283170 + 9945283171.

It is an arithmetic number, because the mean of its divisors is an integer number (9945283171).

Almost surely, 2^19890566341 is an apocalyptic number.

It is an amenable number.

19890566341 is a deficient number, since it is larger than the sum of its proper divisors (1).

19890566341 is an equidigital number, since it uses as much as digits as its factorization.

19890566341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 19890566341 in words is "nineteen billion, eight hundred ninety million, five hundred sixty-six thousand, three hundred forty-one".