6555025661 has 2 divisors, whose sum is σ = 6555025662. Its totient is φ = 6555025660.

The previous prime is 6555025639. The next prime is 6555025663. The reversal of 6555025661 is 1665205556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5617502500 + 937523161 = 74950^2 + 30619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6555025661 is a prime.

It is a super-2 number, since 2×6555025661² = 85936722832736973842, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 6555025663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6555025663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3277512830 + 3277512831.

It is an arithmetic number, because the mean of its divisors is an integer number (3277512831).

Almost surely, 2^6555025661 is an apocalyptic number.

It is an amenable number.

6555025661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6555025661 is an equidigital number, since it uses as much as digits as its factorization.

6555025661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 41.

The square root of 6555025661 is about 80963.1129651028. The cubic root of 6555025661 is about 1871.5070411219.

The spelling of 6555025661 in words is "six billion, five hundred fifty-five million, twenty-five thousand, six hundred sixty-one".