13205968665 has 32 divisors (see below), whose sum is σ = 21353473152. Its totient is φ = 6968640000.

The previous prime is 13205968631. The next prime is 13205968687. The reversal of 13205968665 is 56686950231.

It is not a de Polignac number, because 13205968665 - 2⁷ = 13205968537 is a prime.

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, 3696330 + ... + 3699900.

It is an arithmetic number, because the mean of its divisors is an integer number (667296036).

Almost surely, 2^13205968665 is an apocalyptic number.

13205968665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13205968665 is a deficient number, since it is larger than the sum of its proper divisors (8147504487).

13205968665 is a wasteful number, since it uses less digits than its factorization.

13205968665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6121.

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 13205968665 in words is "thirteen billion, two hundred five million, nine hundred sixty-eight thousand, six hundred sixty-five".