19963731609 has 64 divisors (see below), whose sum is σ = 30805632000. Its totient is φ = 12769747200.

The previous prime is 19963731607. The next prime is 19963731637. The reversal of 19963731609 is 90613736991.

It is not a de Polignac number, because 19963731609 - 2¹ = 19963731607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19963731607) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13969707 + ... + 13971135.

It is an arithmetic number, because the mean of its divisors is an integer number (481338000).

Almost surely, 2^19963731609 is an apocalyptic number.

It is an amenable number.

19963731609 is a deficient number, since it is larger than the sum of its proper divisors (10841900391).

19963731609 is a wasteful number, since it uses less digits than its factorization.

19963731609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 54.

The spelling of 19963731609 in words is "nineteen billion, nine hundred sixty-three million, seven hundred thirty-one thousand, six hundred nine".