6668025649 has 2 divisors, whose sum is σ = 6668025650. Its totient is φ = 6668025648.

The previous prime is 6668025619. The next prime is 6668025677. The reversal of 6668025649 is 9465208666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6667865649 + 160000 = 81657^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668025649 - 2²⁷ = 6533807921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6668025596 and 6668025605.

It is not a weakly prime, because it can be changed into another prime (6668025619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334012824 + 3334012825.

It is an arithmetic number, because the mean of its divisors is an integer number (3334012825).

Almost surely, 2^6668025649 is an apocalyptic number.

It is an amenable number.

6668025649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668025649 is an equidigital number, since it uses as much as digits as its factorization.

6668025649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The square root of 6668025649 is about 81657.9797019250. The cubic root of 6668025649 is about 1882.1999342072.

It can be divided in two parts, 66680 and 25649, that added together give a palindrome (92329).

The spelling of 6668025649 in words is "six billion, six hundred sixty-eight million, twenty-five thousand, six hundred forty-nine".