19749617668 has 12 divisors (see below), whose sum is σ = 37703815632. Its totient is φ = 8977098920.

The previous prime is 19749617639. The next prime is 19749617707. The reversal of 19749617668 is 86671694791.

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, 224427430 + ... + 224427517.

It is an arithmetic number, because the mean of its divisors is an integer number (3141984636).

Almost surely, 2^19749617668 is an apocalyptic number.

It is an amenable number.

19749617668 is a deficient number, since it is larger than the sum of its proper divisors (17954197964).

19749617668 is a wasteful number, since it uses less digits than its factorization.

19749617668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448854962 (or 448854960 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 64.

The spelling of 19749617668 in words is "nineteen billion, seven hundred forty-nine million, six hundred seventeen thousand, six hundred sixty-eight".