116566065661 has 4 divisors (see below), whose sum is σ = 117049742524. Its totient is φ = 116082388800.

The previous prime is 116566065599. The next prime is 116566065667. The reversal of 116566065661 is 166560665611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166560665611 = 59 ⋅2823062129.

It can be written as a sum of positive squares in 2 ways, for example, as 65571844900 + 50994220761 = 256070^2 + 225819^2 .

It is a cyclic number.

It is not a de Polignac number, because 116566065661 - 2¹³ = 116566057469 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 (116566065667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241838070 + ... + 241838551.

It is an arithmetic number, because the mean of its divisors is an integer number (29262435631).

Almost surely, 2^116566065661 is an apocalyptic number.

It is an amenable number.

116566065661 is a deficient number, since it is larger than the sum of its proper divisors (483676863).

116566065661 is an equidigital number, since it uses as much as digits as its factorization.

116566065661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483676862.

The product of its (nonzero) digits is 1166400, while the sum is 49.

It can be divided in two parts, 1165660 and 65661, that added together give a palindrome (1231321).

The spelling of 116566065661 in words is "one hundred sixteen billion, five hundred sixty-six million, sixty-five thousand, six hundred sixty-one".