19866060523 has 2 divisors, whose sum is σ = 19866060524. Its totient is φ = 19866060522.

The previous prime is 19866060521. The next prime is 19866060547. The reversal of 19866060523 is 32506066891.

It is a weak prime.

It is an emirp because it is prime and its reverse (32506066891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19866060523 - 2¹ = 19866060521 is a prime.

Together with 19866060521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19866060521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9933030261 + 9933030262.

It is an arithmetic number, because the mean of its divisors is an integer number (9933030262).

Almost surely, 2^19866060523 is an apocalyptic number.

19866060523 is a deficient number, since it is larger than the sum of its proper divisors (1).

19866060523 is an equidigital number, since it uses as much as digits as its factorization.

19866060523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 19866060523 in words is "nineteen billion, eight hundred sixty-six million, sixty thousand, five hundred twenty-three".