19790281664 has 28 divisors (see below), whose sum is σ = 39384558264. Its totient is φ = 9866613504.

The previous prime is 19790281663. The next prime is 19790281669. The reversal of 19790281664 is 46618209791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790281663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423359 + ... + 467774.

Almost surely, 2^19790281664 is an apocalyptic number.

It is an amenable number.

19790281664 is a deficient number, since it is larger than the sum of its proper divisors (19594276600).

19790281664 is an equidigital number, since it uses as much as digits as its factorization.

19790281664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891492 (or 891482 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 19790281664 in words is "nineteen billion, seven hundred ninety million, two hundred eighty-one thousand, six hundred sixty-four".