19505870346605 has 18 divisors (see below), whose sum is σ = 23441925896298. Its totient is φ = 15581476543200.

The previous prime is 19505870346553. The next prime is 19505870346619. The reversal of 19505870346605 is 50664307850591.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 562737024964 + 18943133321641 = 750158^2 + 4352371^2 .

It is not a de Polignac number, because 19505870346605 - 2²² = 19505866152301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10260846155 + ... + 10260848055.

It is an arithmetic number, because the mean of its divisors is an integer number (1302329216461).

Almost surely, 2^{19505870346605} is an apocalyptic number.

It is an amenable number.

19505870346605 is a deficient number, since it is larger than the sum of its proper divisors (3936055549693).

19505870346605 is an frugal number, since it uses more digits than its factorization.

19505870346605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5885 (or 2945 counting only the distinct ones).

The product of its (nonzero) digits is 27216000, while the sum is 59.

The spelling of 19505870346605 in words is "nineteen trillion, five hundred five billion, eight hundred seventy million, three hundred forty-six thousand, six hundred five".