19649741568 has 36 divisors (see below), whose sum is σ = 52296970488. Its totient is φ = 6549913600.

The previous prime is 19649741563. The next prime is 19649741591. The reversal of 19649741568 is 86514794691.

It is a super-2 number, since 2×19649741568² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19649741563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12792033 + ... + 12793568.

Almost surely, 2^19649741568 is an apocalyptic number.

It is an amenable number.

19649741568 is an abundant number, since it is smaller than the sum of its proper divisors (32647228920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19649741568 is an equidigital number, since it uses as much as digits as its factorization.

19649741568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25585620 (or 25585606 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The spelling of 19649741568 in words is "nineteen billion, six hundred forty-nine million, seven hundred forty-one thousand, five hundred sixty-eight".