19691543345 has 16 divisors (see below), whose sum is σ = 24285115008. Its totient is φ = 15318898560.

The previous prime is 19691543299. The next prime is 19691543369. The reversal of 19691543345 is 54334519691.

It is a de Polignac number, because none of the positive numbers 2^k-19691543345 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19691543293 and 19691543302.

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 15 ways as a sum of consecutive naturals, for example, 93509 + ... + 219378.

It is an arithmetic number, because the mean of its divisors is an integer number (1517819688).

Almost surely, 2^19691543345 is an apocalyptic number.

It is an amenable number.

19691543345 is a deficient number, since it is larger than the sum of its proper divisors (4593571663).

19691543345 is a wasteful number, since it uses less digits than its factorization.

19691543345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313240.

The product of its digits is 1749600, while the sum is 50.

The spelling of 19691543345 in words is "nineteen billion, six hundred ninety-one million, five hundred forty-three thousand, three hundred forty-five".