116566021157 has 4 divisors (see below), whose sum is σ = 116566707276. Its totient is φ = 116565335040.

The previous prime is 116566021153. The next prime is 116566021199. The reversal of 116566021157 is 751120665611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 751120665611 = 753979 ⋅996209.

It can be written as a sum of positive squares in 2 ways, for example, as 70755468001 + 45810553156 = 265999^2 + 214034^2 .

It is a cyclic number.

It is not a de Polignac number, because 116566021157 - 2² = 116566021153 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 (116566021153) 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, 121253 + ... + 497829.

It is an arithmetic number, because the mean of its divisors is an integer number (29141676819).

Almost surely, 2^116566021157 is an apocalyptic number.

It is an amenable number.

116566021157 is a deficient number, since it is larger than the sum of its proper divisors (686119).

116566021157 is an equidigital number, since it uses as much as digits as its factorization.

116566021157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686118.

The product of its (nonzero) digits is 75600, while the sum is 41.

Adding to 116566021157 its reverse (751120665611), we get a palindrome (867686686768).

The spelling of 116566021157 in words is "one hundred sixteen billion, five hundred sixty-six million, twenty-one thousand, one hundred fifty-seven".