19860364493 has 2 divisors, whose sum is σ = 19860364494. Its totient is φ = 19860364492.

The previous prime is 19860364457. The next prime is 19860364541. The reversal of 19860364493 is 39446306891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10208677444 + 9651687049 = 101038^2 + 98243^2 .

It is a cyclic number.

It is not a de Polignac number, because 19860364493 - 2²⁸ = 19591929037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19860364193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9930182246 + 9930182247.

It is an arithmetic number, because the mean of its divisors is an integer number (9930182247).

Almost surely, 2^19860364493 is an apocalyptic number.

It is an amenable number.

19860364493 is a deficient number, since it is larger than the sum of its proper divisors (1).

19860364493 is an equidigital number, since it uses as much as digits as its factorization.

19860364493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 19860364493 in words is "nineteen billion, eight hundred sixty million, three hundred sixty-four thousand, four hundred ninety-three".