11171621166655 has 4 divisors (see below), whose sum is σ = 13405945399992. Its totient is φ = 8937296933320.

The previous prime is 11171621166617. The next prime is 11171621166707. The reversal of 11171621166655 is 55666112617111.

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

It is not a de Polignac number, because 11171621166655 - 2²³ = 11171612778047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11171621166599 and 11171621166608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1117162116661 + ... + 1117162116670.

It is an arithmetic number, because the mean of its divisors is an integer number (3351486349998).

Almost surely, 2^{11171621166655} is an apocalyptic number.

11171621166655 is a deficient number, since it is larger than the sum of its proper divisors (2234324233337).

11171621166655 is an equidigital number, since it uses as much as digits as its factorization.

11171621166655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234324233336.

The product of its digits is 453600, while the sum is 49.

The spelling of 11171621166655 in words is "eleven trillion, one hundred seventy-one billion, six hundred twenty-one million, one hundred sixty-six thousand, six hundred fifty-five".