19875546613 has 18 divisors (see below), whose sum is σ = 21795081126. Its totient is φ = 18017740800.

The previous prime is 19875546557. The next prime is 19875546629. The reversal of 19875546613 is 31664557891.

It can be written as a sum of positive squares in 9 ways, for example, as 8720384689 + 11155161924 = 93383^2 + 105618^2 .

It is not a de Polignac number, because 19875546613 - 2¹³ = 19875538421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19875546653) 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 17 ways as a sum of consecutive naturals, for example, 31006773 + ... + 31007413.

Almost surely, 2^19875546613 is an apocalyptic number.

19875546613 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19875546613 is a deficient number, since it is larger than the sum of its proper divisors (1919534513).

19875546613 is an frugal number, since it uses more digits than its factorization.

19875546613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417 (or 715 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 55.

The spelling of 19875546613 in words is "nineteen billion, eight hundred seventy-five million, five hundred forty-six thousand, six hundred thirteen".