9191909645455 has 4 divisors (see below), whose sum is σ = 11030291574552. Its totient is φ = 7353527716360.

The previous prime is 9191909645453. The next prime is 9191909645459. The reversal of 9191909645455 is 5545469091919.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9191909645455 - 2¹ = 9191909645453 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9191909645453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 919190964541 + ... + 919190964550.

It is an arithmetic number, because the mean of its divisors is an integer number (2757572893638).

Almost surely, 2^{9191909645455} is an apocalyptic number.

9191909645455 is a deficient number, since it is larger than the sum of its proper divisors (1838381929097).

9191909645455 is a wasteful number, since it uses less digits than its factorization.

9191909645455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838381929096.

The product of its (nonzero) digits is 78732000, while the sum is 67.

The spelling of 9191909645455 in words is "nine trillion, one hundred ninety-one billion, nine hundred nine million, six hundred forty-five thousand, four hundred fifty-five".