655091009191 has 4 divisors (see below), whose sum is σ = 655370129992. Its totient is φ = 654811888392.

The previous prime is 655091009189. The next prime is 655091009197. The reversal of 655091009191 is 191900190556.

655091009191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 655091009191 - 2¹ = 655091009189 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 (655091009197) 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, 139556880 + ... + 139561573.

It is an arithmetic number, because the mean of its divisors is an integer number (163842532498).

Almost surely, 2^655091009191 is an apocalyptic number.

655091009191 is a deficient number, since it is larger than the sum of its proper divisors (279120801).

655091009191 is a wasteful number, since it uses less digits than its factorization.

655091009191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279120800.

The product of its (nonzero) digits is 109350, while the sum is 46.

The spelling of 655091009191 in words is "six hundred fifty-five billion, ninety-one million, nine thousand, one hundred ninety-one".