19652720768 has 24 divisors (see below), whose sum is σ = 39155064615. Its totient is φ = 9825567360.

The previous prime is 19652720761. The next prime is 19652720771. The reversal of 19652720768 is 86702725691.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9826360384 + 9826360384 = 99128^2 + 99128^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=99128.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19652720761) 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 2 ways as a sum of consecutive naturals, for example, 1579853 + ... + 1592243.

Almost surely, 2^19652720768 is an apocalyptic number.

It is an amenable number.

19652720768 is a deficient number, since it is larger than the sum of its proper divisors (19502343847).

19652720768 is an frugal number, since it uses more digits than its factorization.

19652720768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24796 (or 12393 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 19652720768 in words is "nineteen billion, six hundred fifty-two million, seven hundred twenty thousand, seven hundred sixty-eight".