19656590989 has 32 divisors (see below), whose sum is σ = 23287463936. Its totient is φ = 16243053120.

The previous prime is 19656590959. The next prime is 19656591023. The reversal of 19656590989 is 98909565691.

It is not a de Polignac number, because 19656590989 - 2⁵ = 19656590957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19656590939) 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 31 ways as a sum of consecutive naturals, for example, 8064679 + ... + 8067115.

It is an arithmetic number, because the mean of its divisors is an integer number (727733248).

Almost surely, 2^19656590989 is an apocalyptic number.

It is an amenable number.

19656590989 is a deficient number, since it is larger than the sum of its proper divisors (3630872947).

19656590989 is a wasteful number, since it uses less digits than its factorization.

19656590989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825.

The product of its (nonzero) digits is 47239200, while the sum is 67.

The spelling of 19656590989 in words is "nineteen billion, six hundred fifty-six million, five hundred ninety thousand, nine hundred eighty-nine".