19641674549 has 24 divisors (see below), whose sum is σ = 23297800608. Its totient is φ = 16505143200.

The previous prime is 19641674539. The next prime is 19641674561. The reversal of 19641674549 is 94547614691.

It is not a de Polignac number, because 19641674549 - 2⁸ = 19641674293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19641674494 and 19641674503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19641674539) 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 23 ways as a sum of consecutive naturals, for example, 4846574 + ... + 4850624.

It is an arithmetic number, because the mean of its divisors is an integer number (970741692).

Almost surely, 2^19641674549 is an apocalyptic number.

It is an amenable number.

19641674549 is a deficient number, since it is larger than the sum of its proper divisors (3656126059).

19641674549 is a wasteful number, since it uses less digits than its factorization.

19641674549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5985 (or 5978 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The spelling of 19641674549 in words is "nineteen billion, six hundred forty-one million, six hundred seventy-four thousand, five hundred forty-nine".