19698568705 has 4 divisors (see below), whose sum is σ = 23638282452. Its totient is φ = 15758854960.

The previous prime is 19698568697. The next prime is 19698568723. The reversal of 19698568705 is 50786589691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5583227841 + 14115340864 = 74721^2 + 118808^2 .

It is not a de Polignac number, because 19698568705 - 2³ = 19698568697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969856866 + ... + 1969856875.

It is an arithmetic number, because the mean of its divisors is an integer number (5909570613).

Almost surely, 2^19698568705 is an apocalyptic number.

It is an amenable number.

19698568705 is a deficient number, since it is larger than the sum of its proper divisors (3939713747).

19698568705 is an equidigital number, since it uses as much as digits as its factorization.

19698568705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939713746.

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 19698568705 in words is "nineteen billion, six hundred ninety-eight million, five hundred sixty-eight thousand, seven hundred five".