5115656775221 has 4 divisors (see below), whose sum is σ = 5145227045772. Its totient is φ = 5086086504672.

The previous prime is 5115656775197. The next prime is 5115656775233. The reversal of 5115656775221 is 1225776565115.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1994834212996 + 3120822562225 = 1412386^2 + 1766585^2 .

It is a cyclic number.

It is not a de Polignac number, because 5115656775221 - 2⁶ = 5115656775157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5115656775241) 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, 14785135016 + ... + 14785135361.

It is an arithmetic number, because the mean of its divisors is an integer number (1286306761443).

Almost surely, 2^{5115656775221} is an apocalyptic number.

It is an amenable number.

5115656775221 is a deficient number, since it is larger than the sum of its proper divisors (29570270551).

5115656775221 is a wasteful number, since it uses less digits than its factorization.

5115656775221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29570270550.

The product of its digits is 4410000, while the sum is 53.

The spelling of 5115656775221 in words is "five trillion, one hundred fifteen billion, six hundred fifty-six million, seven hundred seventy-five thousand, two hundred twenty-one".