19906535369 has 8 divisors (see below), whose sum is σ = 23279403840. Its totient is φ = 16665936336.

The previous prime is 19906535357. The next prime is 19906535399. The reversal of 19906535369 is 96353560991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19906535369 - 2¹⁶ = 19906469833 is a prime.

It is a super-2 number, since 2×19906535369² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19906535329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33067034 + ... + 33067635.

It is an arithmetic number, because the mean of its divisors is an integer number (2909925480).

Almost surely, 2^19906535369 is an apocalyptic number.

It is an amenable number.

19906535369 is a deficient number, since it is larger than the sum of its proper divisors (3372868471).

19906535369 is an equidigital number, since it uses as much as digits as its factorization.

19906535369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66134719.

The product of its (nonzero) digits is 5904900, while the sum is 56.

The spelling of 19906535369 in words is "nineteen billion, nine hundred six million, five hundred thirty-five thousand, three hundred sixty-nine".