556336661 has 2 divisors, whose sum is σ = 556336662. Its totient is φ = 556336660.

The previous prime is 556336657. The next prime is 556336727. The reversal of 556336661 is 166633655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528310225 + 28026436 = 22985^2 + 5294^2 .

It is a cyclic number.

It is not a de Polignac number, because 556336661 - 2² = 556336657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556336631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278168330 + 278168331.

It is an arithmetic number, because the mean of its divisors is an integer number (278168331).

Almost surely, 2^556336661 is an apocalyptic number.

It is an amenable number.

556336661 is a deficient number, since it is larger than the sum of its proper divisors (1).

556336661 is an equidigital number, since it uses as much as digits as its factorization.

556336661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 41.

The square root of 556336661 is about 23586.7899681156. The cubic root of 556336661 is about 822.4557853562.

It can be divided in two parts, 5563 and 36661, that added together give a palindrome (42224).

The spelling of 556336661 in words is "five hundred fifty-six million, three hundred thirty-six thousand, six hundred sixty-one".