11565166555101 has 4 divisors (see below), whose sum is σ = 15420222073472. Its totient is φ = 7710111036732.

The previous prime is 11565166555057. The next prime is 11565166555127. The reversal of 11565166555101 is 10155566156511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11565166555101 - 2⁹ = 11565166554589 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 (11565166555801) 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, 1927527759181 + ... + 1927527759186.

It is an arithmetic number, because the mean of its divisors is an integer number (3855055518368).

Almost surely, 2^{11565166555101} is an apocalyptic number.

It is an amenable number.

11565166555101 is a deficient number, since it is larger than the sum of its proper divisors (3855055518371).

11565166555101 is an equidigital number, since it uses as much as digits as its factorization.

11565166555101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855055518370.

The product of its (nonzero) digits is 675000, while the sum is 48.

The spelling of 11565166555101 in words is "eleven trillion, five hundred sixty-five billion, one hundred sixty-six million, five hundred fifty-five thousand, one hundred one".