11655505606491 has 16 divisors (see below), whose sum is σ = 17267708694400. Its totient is φ = 7770205229544.

The previous prime is 11655505606489. The next prime is 11655505606627. The reversal of 11655505606491 is 19460650555611.

11655505606491 is a `hidden beast` number, since 1 + 1 + 6 + 55 + 50 + 56 + 0 + 6 + 491 = 666.

It is not a de Polignac number, because 11655505606491 - 2¹ = 11655505606489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11655505606391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2028241 + ... + 5236866.

It is an arithmetic number, because the mean of its divisors is an integer number (1079231793400).

Almost surely, 2^{11655505606491} is an apocalyptic number.

11655505606491 is a deficient number, since it is larger than the sum of its proper divisors (5612203087909).

11655505606491 is an equidigital number, since it uses as much as digits as its factorization.

11655505606491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7324535 (or 7324529 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 11655505606491 in words is "eleven trillion, six hundred fifty-five billion, five hundred five million, six hundred six thousand, four hundred ninety-one".