191064513665 has 32 divisors (see below), whose sum is σ = 245358875520. Its totient is φ = 142409746944.

The previous prime is 191064513623. The next prime is 191064513671. The reversal of 191064513665 is 566315460191.

It is a cyclic number.

It is not a de Polignac number, because 191064513665 - 2¹⁰ = 191064512641 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2366747 + ... + 2446143.

It is an arithmetic number, because the mean of its divisors is an integer number (7667464860).

Almost surely, 2^191064513665 is an apocalyptic number.

It is an amenable number.

191064513665 is a deficient number, since it is larger than the sum of its proper divisors (54294361855).

191064513665 is a wasteful number, since it uses less digits than its factorization.

191064513665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79841.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 191064513665 in words is "one hundred ninety-one billion, sixty-four million, five hundred thirteen thousand, six hundred sixty-five".