19358520985 has 8 divisors (see below), whose sum is σ = 23435803080. Its totient is φ = 15349764864.

The previous prime is 19358520977. The next prime is 19358521033. The reversal of 19358520985 is 58902585391.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1865548864 + 17492972121 = 43192^2 + 132261^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 19358520985 - 2³ = 19358520977 is a prime.

It is an unprimeable number.

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, 17130870 + ... + 17131999.

It is an arithmetic number, because the mean of its divisors is an integer number (2929475385).

Almost surely, 2^19358520985 is an apocalyptic number.

It is an amenable number.

19358520985 is a deficient number, since it is larger than the sum of its proper divisors (4077282095).

19358520985 is a wasteful number, since it uses less digits than its factorization.

19358520985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34262987.

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 19358520985 in words is "nineteen billion, three hundred fifty-eight million, five hundred twenty thousand, nine hundred eighty-five".