19860364397 has 2 divisors, whose sum is σ = 19860364398. Its totient is φ = 19860364396.

The previous prime is 19860364387. The next prime is 19860364411. The reversal of 19860364397 is 79346306891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16520217961 + 3340146436 = 128531^2 + 57794^2 .

It is a cyclic number.

It is not a de Polignac number, because 19860364397 - 2¹² = 19860360301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19860364387) 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, 9930182198 + 9930182199.

It is an arithmetic number, because the mean of its divisors is an integer number (9930182199).

Almost surely, 2^19860364397 is an apocalyptic number.

It is an amenable number.

19860364397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19860364397 is an equidigital number, since it uses as much as digits as its factorization.

19860364397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 19860364397 in words is "nineteen billion, eight hundred sixty million, three hundred sixty-four thousand, three hundred ninety-seven".