16566665656111 has 4 divisors (see below), whose sum is σ = 16727507070352. Its totient is φ = 16405824241872.

The previous prime is 16566665656069. The next prime is 16566665656153. The reversal of 16566665656111 is 11165656666561.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (16566665656069) and next prime (16566665656153).

It is a cyclic number.

It is not a de Polignac number, because 16566665656111 - 2²¹ = 16566663558959 is a prime.

It is a super-2 number, since 2×16566665656111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16566665656111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16566665656811) 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, 80420706966 + ... + 80420707171.

It is an arithmetic number, because the mean of its divisors is an integer number (4181876767588).

Almost surely, 2^{16566665656111} is an apocalyptic number.

16566665656111 is a deficient number, since it is larger than the sum of its proper divisors (160841414241).

16566665656111 is a wasteful number, since it uses less digits than its factorization.

16566665656111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160841414240.

The product of its digits is 34992000, while the sum is 61.

The spelling of 16566665656111 in words is "sixteen trillion, five hundred sixty-six billion, six hundred sixty-five million, six hundred fifty-six thousand, one hundred eleven".