19641011665 has 32 divisors (see below), whose sum is σ = 26372449152. Its totient is φ = 13918272000.

The previous prime is 19641011641. The next prime is 19641011717. The reversal of 19641011665 is 56611014691.

It is not a de Polignac number, because 19641011665 - 2¹⁷ = 19640880593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1918410 + ... + 1928620.

It is an arithmetic number, because the mean of its divisors is an integer number (824139036).

Almost surely, 2^19641011665 is an apocalyptic number.

It is an amenable number.

19641011665 is a deficient number, since it is larger than the sum of its proper divisors (6731437487).

19641011665 is a wasteful number, since it uses less digits than its factorization.

19641011665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11121.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 19641011665 in words is "nineteen billion, six hundred forty-one million, eleven thousand, six hundred sixty-five".