19505852813 has 2 divisors, whose sum is σ = 19505852814. Its totient is φ = 19505852812.

The previous prime is 19505852803. The next prime is 19505852851. The reversal of 19505852813 is 31825850591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19113892009 + 391960804 = 138253^2 + 19798^2 .

It is a cyclic number.

It is not a de Polignac number, because 19505852813 - 2⁴ = 19505852797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19505852803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9752926406 + 9752926407.

It is an arithmetic number, because the mean of its divisors is an integer number (9752926407).

Almost surely, 2^19505852813 is an apocalyptic number.

It is an amenable number.

19505852813 is a deficient number, since it is larger than the sum of its proper divisors (1).

19505852813 is an equidigital number, since it uses as much as digits as its factorization.

19505852813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 19505852813 in words is "nineteen billion, five hundred five million, eight hundred fifty-two thousand, eight hundred thirteen".