6255516221 has 4 divisors (see below), whose sum is σ = 6259707612. Its totient is φ = 6251324832.

The previous prime is 6255516209. The next prime is 6255516251. The reversal of 6255516221 is 1226155526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226155526 = 2 ⋅613077763.

It can be written as a sum of positive squares in 2 ways, for example, as 4464110596 + 1791405625 = 66814^2 + 42325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6255516221 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 (6255516251) 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, 2093456 + ... + 2096441.

It is an arithmetic number, because the mean of its divisors is an integer number (1564926903).

Almost surely, 2^6255516221 is an apocalyptic number.

It is an amenable number.

6255516221 is a deficient number, since it is larger than the sum of its proper divisors (4191391).

6255516221 is a wasteful number, since it uses less digits than its factorization.

6255516221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191390.

The product of its digits is 36000, while the sum is 35.

The square root of 6255516221 is about 79091.8214545600. The cubic root of 6255516221 is about 1842.5575081513.

The spelling of 6255516221 in words is "six billion, two hundred fifty-five million, five hundred sixteen thousand, two hundred twenty-one".